Being a human and Muslim, our first relationship is with Merciful Rab عَزَّوَجَلَّ because He alone is our Creator and Owner. Allah عَزَّوَجَلَّ has mentioned the qualities of the true believers at many places in the Glorious Quran and the blessed Ahadees. Let’s study the blessed Quranic verses which mention the laws and commandments for those having Iman and are recognised as Mumin and the blessed Quranic verses which mention the qualities of believers.
1 When Allah’s name is mentioned in front of a Muslim, his heart is overwhelmed with awe and majesty of the Allah Almighty. When the blessed Quranic verses are recited in front of him, his faith and trust become stronger upon his Rab عَزَّوَجَلَّ. Allah عَزَّوَجَلَّ says:
اِنَّمَا الْمُؤْمِنُوْنَ الَّذِیْنَ اِذَا ذُكِرَ اللّٰهُ وَ جِلَتْ قُلُوْبُهُمْ وَ اِذَا تُلِیَتْ عَلَیْهِمْ اٰیٰتُهٗ زَادَتْهُمْ اِیْمَانًا وَّ عَلٰى رَبِّهِمْ یَتَوَكَّلُوْنَۚۖ(۲)
Only they are believers whose hearts fear when Allah is remembered, and when His Verses are recited upon them; their faith increases, and who trust only in their Lord.
[Kanz-ul-Iman (translation of Quran)] (Part 9, Surah Al-Anfaal, Ayah 2)
2 A Muslim is the one who seeks repentance abundantly in the court of Allah عَزَّوَجَلَّ and glorifies Allah عَزَّوَجَلَّ upon gaining every blessing and facing trial. Allah عَزَّوَجَلَّ says:
اَلتَّآىٕبُوْنَ الْعٰبِدُوْنَ الْحٰمِدُوْنَ السَّآىٕحُوْنَ الرّٰكِعُوْنَ السّٰجِدُوْنَ
Those who repent, who worship, who praise (Allah), who fast, who bow, who prostrate.
[Kanz-ul-Iman (translation of Quran)] (Part 11, Surah At-Taubah, Ayah 112)
3 Devotedly following the Beloved Prophet صَلَّى اللّٰەُ عَلَيْهِ وَاٰلِهٖ وَسَلَّم, when a Muslim intends and resolves to perform any permissible act, he trusts Allah عَزَّوَجَلَّ and remains firm on it [i.e. trust]. Allah عَزَّوَجَلَّ says:
فَاِذَا عَزَمْتَ فَتَوَكَّلْ عَلَى اللّٰهِؕ-اِنَّ اللّٰهَ یُحِبُّ الْمُتَوَكِّلِیْنَ(۱۵۹)
And when you come to a firm decision regarding any matter, then have trust in Allah; indeed Allah loves those who have trust (in Him).
[Kanz-ul-Iman (translation of Quran)] (Part 4, Surah Aal-e-‘Imran, Ayah 159)
4 When a Muslim is conveyed the command of his Allah عَزَّوَجَلَّ and the Beloved Prophet صَلَّى اللّٰەُ عَلَيْهِ وَاٰلِهٖ وَسَلَّم and he is called towards the command and decision of Allah عَزَّوَجَلَّ and His Beloved Prophet صَلَّى اللّٰەُ عَلَيْهِ وَاٰلِهٖ وَسَلَّم, he immediately acknowledges it and willingly obeys it. Allah عَزَّوَجَلَّ says:
اِنَّمَا كَانَ قَوْلَ الْمُؤْمِنِیْنَ اِذَا دُعُوْۤا اِلَى اللّٰهِ وَ رَسُوْلِهٖ لِیَحْكُمَ بَیْنَهُمْ اَنْ یَّقُوْلُوْا سَمِعْنَا وَ اَطَعْنَاؕ-وَ اُولٰٓىٕكَ هُمُ الْمُفْلِحُوْنَ(۵۱)
The saying of the Muslims is only this; when they are called towards Allah and the Messenger; that the Messenger may judge between them, so they submit, ‘We have heard and obeyed.’ And it is only these who are successful.
[Kanz-ul-Iman (translation of Quran)] (Part 18, Surah An-Noor, Ayah 51)
5 A Muslim is the one who does not raise his voice and he shows great respect and reverence in the court of the Beloved Prophet صَلَّى اللّٰەُ عَلَيْهِ وَاٰلِهٖ وَسَلَّم and feels afraid of losing Iman and letting his deeds go to waste. Allah Kareem says:
یٰۤاَیُّهَا الَّذِیْنَ اٰمَنُوْا لَا تَرْفَعُوْۤا اَصْوَاتَكُمْ فَوْقَ صَوْتِ النَّبِیِّ
وَ لَا تَجْهَرُوْا لَهٗ بِالْقَوْلِ كَجَهْرِ بَعْضِكُمْ لِبَعْضٍ اَنْ تَحْبَطَ اَعْمَالُكُمْ وَ اَنْتُمْ لَا تَشْعُرُوْنَ(۲)
O believers! Do not raise your voices higher than the voice of this Conveyor of the unseen (Prophet Muhammad), and nor speak aloud in his august court just like you speak aloud to one another amongst yourselves. In case your deeds go to waste whilst you are unaware.
[Kanz-ul-Iman (translation of Quran)] (Part 26, Surah Al-Hujurat, Ayah 2)
6 A Muslim always shows respect and reverence for the Beloved Prophet صَلَّى اللّٰەُ عَلَيْهِ وَاٰلِهٖ وَسَلَّم and the [blessed] things which are associated with the Beloved Prophet صَلَّى اللّٰەُ عَلَيْهِ وَاٰلِهٖ وَسَلَّم, but rather he remains careful and keeps away from the words in which there is a slightest doubt of disrespect for the Beloved Prophet صَلَّى اللّٰەُ عَلَيْهِ وَاٰلِهٖ وَسَلَّم. It is stated in the Glorious Quran:
یٰۤاَیُّهَا الَّذِیْنَ اٰمَنُوْا لَا تَقُوْلُوْا رَاعِنَا وَ قُوْلُوا انْظُرْنَا وَ اسْمَعُوْاؕ-وَ لِلْكٰفِرِیْنَ عَذَابٌ اَلِیْمٌ(۱۰۴)
O Believers! Do not say (to Prophet Muhammad) ‘Raa’ina’, and submit as so, ‘Unzurna’ (meaning, that please grant us your attention so that we understand well) and (O Muslims!) listen attentively (to his discourse) from the beginning. And for the disbelievers is a painful torment.
[Kanz-ul-Iman (translation of Quran)] (Part 2, Surah Al-Baqarah, Ayah 104)
7 Salah is the Mi’raaj for the Muslims. Muslims have been ordered at many places in the Glorious Quran to perform Salah. A Muslim is the one who is punctual and he performs Salah with humility and devotion. Allah عَزَّوَجَلَّ says:
الَّذِیْنَ هُمْ فِیْ صَلَاتِهِمْ خٰشِعُوْنَۙ
Those who humble themselves in their Salah.
[Kanz-ul-Iman (translation of Quran)] (Part 18, Surah Al-Muminoon, Ayah 2)
It is stated at another place in the Glorious Quran:
وَ الَّذِیْنَ هُمْ عَلٰى صَلَاتِهِمْ یُحَافِظُوْنَؕ
And those who protect their Salah.
[Kanz-ul-Iman (translation of Quran)] (Part 29, Surah Al-Ma’aarij, Ayah 34)
8 A true Muslim is the one who performs Sajdah upon the command of Allah عَزَّوَجَلَّ and glorifies Allah عَزَّوَجَلَّ. As when Satan became arrogant, he refused to perform Sajdah upon the command of Allah عَزَّوَجَلَّ; a Muslim does not do so but rather when he is commanded to perform Sajdah, he stays away from arrogance and falls down in prostration in the blessed court of Rab عَزَّوَجَلَّ.
اِنَّمَا یُؤْمِنُ بِاٰیٰتِنَا الَّذِیْنَ اِذَا ذُكِّرُوْا بِهَا خَرُّوْا سُجَّدًا وَّ سَبَّحُوْا بِحَمْدِ رَبِّهِمْ وَ هُمْ لَا یَسْتَكْبِرُوْنَ۩ 
Only those believe in Our Verses who, when they are reminded of them, fall down in prostration and proclaim the Purity of their Lord while praising Him, and are not arrogant.
[Kanz-ul-Iman (translation of Quran)] (Part 21, Surah As-Sajdah, Ayah 15)
9 A Muslim is the one who observes obligatory fasts with punctuality. Allah عَزَّوَجَلَّ says:
یٰۤاَیُّهَا الَّذِیْنَ اٰمَنُوْا كُتِبَ عَلَیْكُمُ الصِّیَامُ كَمَا كُتِبَ عَلَى الَّذِیْنَ مِنْ قَبْلِكُمْ لَعَلَّكُمْ تَتَّقُوْنَۙ
O believers! Fasting has been made obligatory upon you, like it was made obligatory upon those before you, that you may attain piety.
[Kanz-ul-Iman (translation of Quran)] (Part 2, Surah Al-Baqarah, Ayah 183)
10 A Muslim also pays Zakah when it becomes obligatory for him.
وَ الَّذِیْنَ هُمْ لِلزَّكٰوةِ فٰعِلُوْنَۙ
And who are active in the payment of Zakah.
[Kanz-ul-Iman (translation of Quran)] (Part 18, Surah Al-Muminoon, Ayah 4)
11 The greatness of a Muslim is that he spends from the wealth and sustenance he has been bestowed by Allah عَزَّوَجَلَّ. Allah عَزَّوَجَلَّ says:
وَ مِمَّا رَزَقْنٰهُمْ یُنْفِقُوْنَۙ
And spend in Our path from the sustenance We have bestowed (upon them).
[Kanz-ul-Iman (translation of Quran)] (Part 1, Surah Al-Baqarah, Ayah 3)
12 When a Muslim becomes able to afford Hajj expenses, Hajj becomes Fard upon him; so, he starts preparation to perform Hajj of Allah’s House. Allah عَزَّوَجَلَّ says:
وَ لِلّٰهِ عَلَى النَّاسِ حِجُّ الْبَیْتِ مَنِ اسْتَطَاعَ اِلَیْهِ سَبِیْلًاؕ-
And performing Hajj of this house, for the sake of Allah, is (an obligation) upon the people, who have the means to reach it.
[Kanz-ul-Iman (translation of Quran)] (Part 4, Surah Aal-e-‘Imran, Ayah 97)
13 This is also from the eminent attributes of the Muslims. A Muslim not only takes care of himself but he also remains anxious about other Muslims. It is for this reason that he invites people to call to righteousness and forbids them from evil for their goodness in the world and Hereafter. Allah عَزَّوَجَلَّ says:
وَ الْمُؤْمِنُوْنَ وَ الْمُؤْمِنٰتُ بَعْضُهُمْ اَوْلِیَآءُ بَعْضٍۘ-یَاْمُرُوْنَ بِالْمَعْرُوْفِ وَ یَنْهَوْنَ عَنِ الْمُنْكَرِ
And the Muslim men and Muslim women are the friends (helpers in religion) of one another; commanding good and forbidding evil.
[Kanz-ul-Iman (translation of Quran)] (Part 10, Surah At-Taubah, Ayah 71)
 This is an Ayah of Sajdah. Sajdah becomes Wajib upon the one who recites or listens to it.