Musannaf Ibn Abi Shayba 6:587

Ali ibn Mushir narrated to us, from al-Walid ibn Abd Allah ibn Jumay', from al-Zuhri, who said: I saw Ibrahim, when he prayed over a funeral, raise his hands, then he said the takbir. Then he would not raise his hands in what remained [of the prayer]. And he would say the takbir four times.