The Ruling on Praying Behind Sinners

The question: Also, the last question asks: Is one who leaves the Fajr prayer and shaves his beard to be appointed as imam for the Muslims in the prayers?
The answer: The one who does not pray Fajr in congregation is a sinner, and the one who shaves his beard is a sinner, and so is the smoker and the drinker of alcohol; they are all sinners. Therefore, it is not befitting for them to be imams for the Muslims. It is befitting for the rulers not to appoint them as imams. However, if a person is afflicted by them and prays behind them, his prayer is valid. If a person is afflicted by them and prays behind them, his prayer is valid, just as Ibn 'Umar and others of the Companions prayed behind al-Hajjaj ibn Yusuf, who was among the most unjust of people, a shedder of blood; because he is a Muslim and he only has sins.
So the conclusion is: that sin does not prevent imamate, but its owner is deficient in imamate. It is better to pray behind someone else, and it is obligatory to replace him if his sin is apparent. It is obligatory to replace him. It is upon the rulers who have authority over imamate, appointment, and dismissal, that they dismiss him and seek a person who is sound from these sins, as much as possible. But if he leaves Fajr entirely, he does not pray it at all, this is disbelief, he is not an imam, we seek refuge in Allah. If he does not pray it at all, this is disbelief. But it appears that the questioner means he does not pray it in congregation, he is lazy about it, so he is a sinner. And Ibn Mas'ud (may Allah be pleased with him) said: meaning: in congregation.
The conclusion is this: if one leaves the congregation for Fajr, Zuhr, or 'Asr, this is a sin if done without an excuse. A person known for this should not be an imam; rather, he should be removed and replaced by an imam who is better and more beneficial to the Muslims and further from forbidden things. However, as mentioned earlier, if a person is afflicted with such matters, his prayer is valid. He should not pray alone; he should pray with the people. If he is afflicted by praying behind an imam who shaves his beard, an imam who smokes, or an imam who may be lazy about some of the congregational prayers, he should pray behind him. Prayer in congregation is required, and this sinner's harm is upon himself. The advisors should guide him, direct him, and warn him of the consequences of this bad action. And Allah (Exalted and Majestic is He) is gentle with His servants . He may grant him success in repentance because of the advice of his brothers, or he may be deterred and return to the right path because of the advice and guidance. Yes.