It is narrated from Salim al-Barrad: We came to Sayyiduna Abu Mas'ud Uqbah bin Amr al-Ansari (may Allah be pleased with him) and said: Describe to us the manner of the prayer of the Messenger of Allah (peace and blessings be upon him). He stood in front of us in the mosque and said the takbir. Then when he bowed, he placed his hands on his knees and his fingers a little below them, and kept his elbows spread apart, until every limb settled in its place. Then he said 'Sami'a Allahu liman hamidah', then stood up until every limb settled in its place. Then he said the takbir and prostrated, placed his palms on the ground and kept his elbows away from his sides, until every limb settled in its place. Then he raised his head and sat until every limb was level in its place. Then he made the second prostration in the same way, and then prayed four rak'ahs in the same way. Then he said: "This is how we saw the Messenger of Allah (peace and blessings be upon him) praying."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2769