Abu Dawud Book 2, Hadith Number 1294.

Narated By ‘Urwah b. Ruwaim : An al-Ansari narrated to me: The Apostle of Allah (PBUH) said to ja’far. He then narrated the tradition in a like manner. This version has the words: “In the second prostration of the first rak’ah,” in addition to the words transmitted by Mahdi b. Maimun (in the previous tradition).