The Messenger of Allaah (peace be upon him) said: “The worst type of thief is the one who steals from his prayer.”
The people asked, “O Messenger of Allaah, how can a person steal from his prayer?”
He said: “By not doing ruku’ and sujood properly.”
--Reported by Imaam Ahmad
The Prophet (peace and blessings of Allaah be upon him) said:
“A man’s prayer is not good enough until his back is straight in ruku’ and sujood.”
--Reported by Abu Dawud, 1/533
