Masjid at the time of Jama’at that perhaps his Wudu (ablution) might have been broken or he may have had some other Shar’i reasons.

About good presumptions

Talking about the types and ruling of presumption, Sadr-ul-Afaadil ‘Allamah Maulana Mufti Sayyid Muhammad Na’eemuddin Muradabadi عَـلَيْهِ رَحۡمَةُ الـلّٰـهِ الۡـهَادِی has stated: ‘Presumption has many types; one is that it is Wajib to have a  good presumption/opinion towards Allah عَزَّوَجَلَّ; one is Mustahab that is to have good presumptions towards a true Muslim; one is prohibited and Haraam that is to have bad presumptions towards Allah عَزَّوَجَلَّ and to have bad presumptions towards a true Muslim; one is permissible that is to have such a presumption about a sinner regarding what he does. (Khazaain-ul-‘Irfan)

Blessed Ahadees about good opinion

1.         اِنَّ حُسۡنَ الظَّنِّ مِنَ الۡاِيۡمَان: i.e., Undoubtedly, having good opinions is part of faith. (Tafseer Ruh-ul-Bayan)

2.         Addressing the Holy Ka’bah, the Holiest Prophet صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم said: ‘How good you and your atmosphere are! How great you are and how great is your sacredness! By the One under Whose omnipotence the life of Muhammad (صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم) is! In the court of Allah عَزَّوَجَلَّ, the sacredness of the life and wealth of a Mu’min and of having a good opinion about him is greater than even your sacredness.’

(Ibn Majah, vol. 4, pp. 319, Hadees 3932)

3.         حُسۡنُ الظَّنِّ مِنۡ حُسۡنِ الۡعِبَادَةِ, ‘Having a good opinion [about others] is from good worship.’ (Sunan Abi Dawood, vol. 4, pp. 388, Hadees 4993)

While elaborating on the abovementioned Hadees, the renowned commentator of the Quran, Mufti Ahmad Yar Khan رَحْمَةُ اللهِ تَعَالٰی عَلَيْه has stated, ‘This means that to hold a good opinion about other Muslims and