The Amount of Dhikr in Ruku' and Sujud, and Lengthening Them

Question:
In this matter, how valid is the statement regarding tranquility, except that what is obligatory is the understanding of what has been transmitted. However, the understanding of what has been transmitted in his prayer and his taslim may be sufficient as proof.

Answer:
The obligatory dhikr is once: "Subhan Rabbi al-Azim" (Glory be to my Lord, the Exalted) once, and "Subhan Rabbi al-A'la" (Glory be to my Lord, the Most High) once. As for the recommended adhkar, I do not say that it is obligatory for a person to lengthen the ruku' or the sujud until he recites them. If he recites them and lengthens the ruku' and sujud, there is no harm. If he lengthens them but limits himself to saying "Subhan Rabbi al-Azim" and "Subhan Rabbi al-A'la," that is sufficient. This is especially true for the imam; the imam should not burden the ma'mumin by lengthening the ruku' just to reach ten tasbihat, or lengthening the sujud, or lengthening the ruku' and sujud for the sake of du'a', thereby burdening the ma'mumin. This imam should consider the conditions of the ma'mumin and not burden them. But if he prays for himself and prays alone, let him lengthen it as much as he wishes, as the Prophet (peace and blessings be upon him) said. Yes.