Hazrat Ghalib bin Bakr says that if I am asked about the most virtuous person in the mosque, "Do you testify that he is a believer with perfect faith and free from hypocrisy?" then I will not testify, and if I do testify, that testimony would be a testimony that he is in Paradise. If I am asked about the worst person and people say, "Do you testify that he is a complete hypocrite, devoid of faith?" then I will not testify, because if I do testify, that testimony would be that he is in Hell.

Hazrat Usman bin Abi Safiyyah Al-Ansari, may Allah have mercy on him, narrates that Hazrat Abdullah bin Abbas, may Allah be pleased with them both, said to one of his sons: Shall I not get you married? For there is no servant who commits adultery except that Allah takes away from him the light of faith.

Hazrat Aisha (may Allah be pleased with her) narrates that the Messenger of Allah (peace and blessings be upon him) said: When an adulterer commits adultery, his faith does not remain. And when a thief commits theft, his faith also does not remain.