Muhammad bin Ibrahim bin al-Harith محمد بن إبراهيم بن الحارث · The Book on Salat (Prayer)

"When we awoke, we went to Allah's Messenger to inform him of the dream. He said: 'Indeed this dream is true. So go to Bilal, for he has a better and louder voice than you. Convey to him what was said to you, so that he may call (to the prayer) with that.'" He said: "When Umar bin Al-Khattab heard Bilal calling for the prayer he went to Allah's Messenger, and he was dragging his Izar, (as he was hurrying)…

Allah's Messenger Saying: "When the worshipper prostrates with him: His face, his hands, his knees, and his feet."

"The Prophet ordered placing the hands (on the ground) keeping the feet erect. (by resting feet on the toes and making the tips of the toes facing the Qiblah)."

"The Prophet ordered placing the hands (on the ground)." And he mentioned in it: "From his father."

Allah's Messenger (S) said: "When the Iqamah has been called for the Salat then there is no Salat except the obligatory."