Is it obligatory upon whoever lives

Q 1: Is it permissible for a person who holds his hands in Salah (Prayer) to offer Salah behind an Imam who does not?

A: Holding the two hands after Takbirat-ul-Ihram (saying: "Allahu Akbar [Allah is the Greatest]" upon starting Prayer), before Ruku` (bowing), (Part No. 7; Page No. 364) after Ruku` and before Sujud (Prostration) is a Sunnah (supererogatory act of worship following the example of the Prophet) which does not invalidate Salah if it is skipped. It is permissible for a person who holds his hands to offer Salah behind an Imam (leader of congregational Prayer) who does not.