Catching a Rak'ah by Catching the Imam in Ruku'

The questioner:
What is Allah’s ruling if one of the messengers enters the mosque? So he entered with him and then heard the people.

The Shaykh:
If he entered after the imam had raised his head, he must make up that rak'ah. But if he caught up with him in it before he raised his head, it suffices for him.

The questioner:
The imam raised his head, but he forgot the tasmi' (saying Allahu Akbar).

The Shaykh:
No, no. If the imam has raised his head, you do not descend into the rak'ah, even if you did not hear the takbir. Yes.

The questioner:
The ruling on catching up the bowing is that sharing in the descent with the imam before he raises his head... is this a summary?

The Shaykh:
He prays, he stays, and the imam is before he raises his head, he catches up with him bowing. Yes.

Another questioner:
And he stands still, or not?

The Shaykh:
Even if the tranquility (tuma'ninah) comes after that, if he leaves it while bowing, it suffices, even if the tranquility and the glorification (tasbih) come after that. Yes. The Sunnah (recommended practice) is during the descent, the Sunnah is during the descent, he says Allahu Akbar when he descends into prostration. The pulpit, during the descent, no one preceded him, and no one preceded him during the descent, and praise be to Allah, Yes.

The presenter:
May Allah reward you. Yes.