Abu al-Zanad أبو الزناد · The Book on Salat (Prayer)

the Prophet said: "When one of you leads the people in prayer then let him be brief, for indeed here are among them the young and the old, the weak and the ill. When one of you prays alone, then let him pray as he wishes."

the Prophet said; "Is it that one of you intends to kneel in his Salat with the kneeling of the camel?"