The obligation of advising one who shows signs of regression

Question:
May Allah guide you. He says: What is my obligation toward someone who was committed to the religion, but then signs of regression and backsliding appeared in him?

Answer:
You should advise him so that he continues in righteousness and repents to Allah for what has happened to him. His past deeds are not invalidated by the regression; his work and effort are not nullified. So you must advise him. If the reason he fell into disobedience is that he keeps company with people who are not upright, or that he sits in gatherings where there is evil, then he should leave them and stay away from them. He should cut off the causes that lead him to sin, and he should increase in the remembrance of Allah and in reciting the Qur'an, and he should maintain the prayers. Allah the Exalted said: So one of the greatest causes for abandoning obscenity and wrongdoing is maintaining the obligatory prayers, as well as the voluntary ones, for prayer forbids obscenity and wrongdoing. Yes.