Is it permissible or not to perform Salah (Prayer) behind an Imam (the one who leads congregational Prayer)
who prays hastily?
Maintaining tranquility during Ruku` (bowing), the standing posture after Ruku`, Sujud (prostration), and the sitting posture between the two prostrations is one of the obligatory acts of Salah. If the Imam is not at ease and hastily performs any of these Rukns (integral pillars), the Salah of the Imam and those led by him is Batil (null and void). Anyone who notices this error on the part of the Imam should advise and guide him. If this Imam accepts the advice, all praise be to Allah; otherwise, no one should pray behind him. Moreover, if possible, the case should be referred to the responsible authority who should prevent him from acting as an Imam and appoint another one who can perform Salah properly.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.