Abd al-Jabbar bin Wa'il (may Allah have mercy on him) relates: When my father came to the Prophet (peace and blessings be upon him), he saw that he (peace and blessings be upon him) would place his right hand on the left, and raise his hands with every takbir.
Hadith Referenceالمعجم الكبير للطبراني / باب الواو / 18294