Sahih Ibn Khuzaymah

It is narrated from Muhammad bin Amr bin Ata that he was sitting with a group of the noble companions of the Prophet (peace be upon him), and they mentioned the prayer of the Messenger of Allah (peace be upon him). Sayyiduna Abu Humayd Sa’idi (may Allah be pleased with him) said, "I remember the prayer of the Messenger of Allah (peace be upon him) better than all of you. I saw that when he said « اللهُ أَكْبَرُ », he would raise his hands to the level of his shoulders. Then when he bowed (in ruku’), he would firmly place his hands on his knees and bend his back. Then when he raised his blessed head, he would stand up straight until every bone returned to its place. Then when he prostrated, he would neither spread his hands out nor keep them completely close, and he would direct the tips of his fingers towards the qiblah. Then when he sat in tashahhud after two rak’ahs, he would sit on his left foot. Then when he sat in the last rak’ah, he would bring his left foot forward and sit on his buttocks."