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ArticlesQuestion:
My question is regarding Salat. 'Umar entered the mosque and finds that they have started. So at the end 'Umar will have to continue the Salat. Another man Ali entered the mosque and finds that 'Umar was praying alone. Can he join 'Umar in the Salat and take 'Umar as an Imaam knowing that 'Umar was just continuing his Salat from another Jamaa'?
Fatwa:
All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad 
is His Slave and Messenger.
is His Slave and Messenger.The scholars, may Allah have mercy on them, differed in opinion about whether or not it is permissible to pray behind someone who is already preceded in prayer. Some of them did not allow this and some others allowed it; Shaykh Al-Islam Ibn Taymiyyah, may Allah have mercy on him, is one such scholar who considers that the preponderant opinion is that it is permissible.
In our view, it is not permissible to take someone as an Imaam, whilst being led in prayer as it is not possible for a person who is being led in prayer to be leading the prayer at the same time. Al-Haythami, may Allah have mercy on him, said that there is a consensus of the scholars, may Allah have mercy on them, about the impermissibility of this. Nonetheless, if a person is preceded in prayer and stands up to complete his prayer, then it is permissible for other people to pray behind him and consider him as an Imaam according to a group of scholars, may Allah have mercy on them, as he is no longer considered as being led in prayer. However, other scholars, may Allah have mercy on them, did not permit this, since this person has already been led in prayer. This is in case he joined one Raka'h or more in prayer with the Imaam, but if he did not catch even one Raka'h with the Imaam, then it is permissible for him to be taken as an Imaam without any difference of opinion that we know of.
Moreover, it is permissible for a person being led in prayer to be leading the same prayer if there is a sound valid religious reason for the Imaam not to continue his prayer [in case his ablution is invalidated for instance], and he is pulled by the Imaam to lead the prayer even though he had been led in the same prayer.
Allah knows best.
Fatwa answered by: The Fatwa Center at Islamweb
