It is narrated from Sayyiduna Malik bin al-Huwayrith (may Allah be pleased with him) that he prayed with the Prophet (peace and blessings be upon him); he said: I saw the Messenger of Allah (peace and blessings be upon him) raise both his hands towards his ears when he said the takbir, when he intended to bow, and when he raised his head from bowing.
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16680