It is narrated from Sayyiduna Wa'il bin Hujr (may Allah be pleased with him) that he said: I thought to myself: I will certainly watch the Messenger of Allah (peace and blessings be upon him) to see how he (peace and blessings be upon him) performs the prayer. I looked at him (peace and blessings be upon him): he (peace and blessings be upon him) stood up, said the takbir and raised his hands up to his ears, then placed his right hand on the back of his left palm, the wrist and the forearm.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2325