If one finds a congregation praying and the imam is wearing long garments or has shaved his beard, does he join them in prayer?

Question:
He says: Honorable Shaykh, may Allah grant you success. If a person enters a mosque while traveling and sees a person or an imam displaying signs of open sinfulness, such as wearing long garments or shaving the beard, or something else, is it better to wait until he finishes his prayer or to join him?

Answer:
If you see the Muslims praying, pray with them and do not wait. Enter and pray with the Muslims, and praise be to Allah. Yes.