The Obligation of Performing the Takbeer and All Other Actions After the Imaam:
The Messenger of Allaah (sallallaahu `alaihi wa sallam) said: “Verily, the Imaam is there to be followed; so when he has made Takbeer (says: Allaahu Akbar) then make Takbeer…”
Reported by Al-Bukhaaree (733) and Muslim (920).
