It is narrated from Sayyiduna Wa'il bin Hujr (may Allah be pleased with him); he said: "I saw the Messenger of Allah (peace and blessings be upon him): when he stood for the prayer he raised his hands, and when he raised his head from the bowing (ruku') he did the same."
Hadith Referenceالمعجم الكبير للطبراني / باب الواو / 18230