If one comes to the congregation and the row is complete, does he pull a worshiper or pray behind the row?

Question:
If a Muslim comes intending to enter the prayer but finds the row complete, does he pull a worshiper to pray with him? Or does he pray alone, following the imam?

Answer:
It is prescribed for him to look for a gap, perhaps he will find one. If he does not find one, he stands with the imam on his right. If that is not possible, he waits and does not pull anyone; because pulling him is injustice and transgression against him, and opening a gap in the row. But he waits. If the prayer is completed and no one comes, he prays alone, and praise be to Allah. He is excused. Yes.

The presenter: May Allah reward you with good. If he prays the first rak'ah alone with the imam, then another worshiper joins him in the second rak'ah, and after the obligatory prayer is finished, does he say the closing salam with the imam, or does he stand up to perform the last rak'ah?

The Shaykh: If he prays one rak'ah, his prayer is invalid, so he must restart with the new person who came and restart with him from the beginning of the prayer. If he continues without restarting, he must repeat it; because his prayer is invalid. That is, he prayed one rak'ah alone behind the row, and the Prophet (peace and blessings be upon him) said: This is authentic from him (peace and blessings be upon him), and it is authentic from him that he ordered the one who prayed alone behind the row to repeat the prayer. But if he bowed alone and then entered the row, or another person stood with him before prostration, his prayer is valid and sufficient, and praise be to Allah, as Abu Bakrah (may Allah be pleased with him) did . Yes.

The presenter: May Allah reward you with good.