The Ruling on the Ma'mum (One Praying Behind the Imam) Lagging Behind the Imam in Ruku' and Sujud

The questioner:
Your Eminence, Shaykh Salih (may Allah preserve you), if the ma'mum lags behind the imam in one of the pillars, for example, if he lags behind in ruku' or sujud until the imam has risen from that pillar, what is the ruling for the one who did this? Is his prayer valid, or is it obligatory for him to make up the rak'ah?

The Shaykh:
He should perform ruku' and sujud after the imam and then catch up with him, and he should not leave out the ruku' or leave out the sujud from the prayer, because it is a pillar of the prayer. Yes.

The questioner:
And if he lags behind until the imam has risen, is the rak'ah invalid and does he have to repeat it?

The Shaykh:
He should perform ruku', even if the imam has risen. I mean, if the imam has risen, the time for ruku' has ended, and he has missed the rak'ah. As for sujud, he should perform sujud after the imam and catch up with the imam. Yes.

The questioner:
And he makes up the rak'ah.

The Shaykh:
No, in the case of sujud, no. If he performed it after the imam, he has performed it in its proper time. As for ruku', it must be with the imam or after the imam, and it must not be before him. Yes.

The questioner:
And the rak'ah in which he missed the ruku', does he repeat it?

The Shaykh:
The one in which he missed the ruku' with the imam, did he not perform ruku' after the imam?

The questioner:
Yes, a rak'ah after the imam had risen and begun another pillar.

The Shaykh:
It does not contradict, as long as it is a pillar, he has fulfilled what is required of him.

The presenter:
Yes. May Allah reward you.