If a Person leads a People in an Obligatory Prayer which He has already performed

Question :

Is it permissible for one who has already performed the obligatory prayer to lead another congregation in the same prayer?

Answer:

The scholars have differed regarding whether this is permissible or not, but it appears to us that it is permissible for a person who is praying his obligatory prayer to lead those who have already prayed it, and for one who has already prayed it to lead those who have not, because Mu'ath, may Allah be pleased with him, used to pray with the Prophet then he would return to his people and perform the same prayer with them.

And Abu Dawud narrated in his Sunan that the Prophet led a number of his Companions, may Allah be pleased with them, in the prayer of fear (Salatul-Khawf) consisting of two Rak'ahs, then he prayed two Rak'ahs with another group, then he made the Taslim.Abu Dawud no. 1244. [The claim Allamah Tahawi has made as regards this Hadith that it is Mansukh, is not acceptable because this claim has no supporting proofs with it. Allamah Sindhi said that this Hadith strongly proves that obligatory prayer can be offered behind an Imam offering his voluntary prayer, and the persons opposing this view have no valid reasons for that. (Aunul-Ma'bud, Vol. 4, p.90)] This is one of the two opinions expressed by Imam Ahmad, and the opinion of 'Ata', Al-Awza'i, Ash-Shafi'i and Ibn Al-Munthir. And Allah knows best.

Source:
The Permanent Committee
Fatawa Islamiyah, Vol. 2 Page 175