though trampling the rights of a Muslim, exploiting him or hurting him are Haraam actions which lead one to Hell.

About hurting Muslims without any reason, Allah عَزَّوَجَلَّ says:

اِنَّ    الَّذِیۡنَ   فَتَنُو ا   الۡمُؤۡ  مِنِیۡنَ    وَ  الۡمُؤۡ  مِنٰتِ

ثُمَّ     لَمۡ     یَتُوۡ  بُوۡ ا   فَلَہُمۡ     عَذَابُ   جَہَنَّمَ     وَ لَہُمۡ    عَذَابُ   الۡحَرِ یۡقِ    ﴿ؕ۱۰﴾

Translation from Kanz-ul-Iman: Indeed those who caused hurt to Muslim men and Muslim women, and then did not repent – for them is the punishment of Hell, and for them is the punishment of fire.

(Part 30, Surah Al-Burooj, verse 10)

Usurping rights is cruelty

Dear Islamic brothers! Have you heard the promise of punishment of the Hell-fire for the sins of violating the rights of Muslims, for the acts of cruelty against them and for hurting them unnecessarily! Therefore, be very cautious and prevent yourselves from threatening Muslims, hurting them and frightening them and usurping their rights. Causing injustice, humiliating and insulting someone in public, speaking ill of others, physically or verbally abusing them, forcibly taking what belongs to others etc., are all in fact acts of cruelty.

No doubt, oppressing the people is a sin. It brings about suffering in this worldly life and the Hereafter, and ends up with the punishments of Hell. Cruelty is a violation of the commandments of Allah عَزَّوَجَلَّ and His Beloved and Blessed Prophet صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم and it results in the violation of rights of the people. Sayyid Sharif Jurjaani قُـدِّسَ سِـرُّہُ الـنُّـوۡرَانِی defined the meaning of cruelty in his book, At-Ta’reefat: To misuse something. (At-Ta’reefat lil-Jurjaani, pp. 102) In the Shari’ah, cruelty means to cause injustice with someone’s rights or to misuse something or to punish one who has not committed the offence.

(Mirat, vol. 6, pp. 669)