Nafi' bin Jubayr bin Mut'im (may Allah have mercy on him) narrates from his father, Sayyiduna Jubayr bin Mut'im (may Allah be pleased with him), who said: the Messenger of Allah (peace and blessings be upon him) said: "I have become heavy, so do not get ahead of me in standing, bowing and prostrating in the prayer."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1566