Hadith 687:9
Waki' narrated to us, Musa bin 'Umayr al-'Anbari narrated to us, from 'Alqamah bin Wa'il al-Hadrami, from his father, who said: "I saw the Messenger of Allah, peace and blessings of Allah be upon him, placing his right hand upon his left in the prayer."
حدثنا وكيع، حدثنا موسى بن عمير العنبري، عن علقمة بن وائل الحضرمي، عن أبيه قال: " رأيت رسول الله صلى الله عليه وسلم واضعا يمينه على شماله في الصلاة "