By this isnad from Ibrahim b. al-Hakam from `Abdullah b. Musa from Sa`d b. Aws from Bilal b. Yahya al-`Absi. He said:

When `Ammar was killed, they came to Hudhayfa, and they said: O Aba `Abdillah! This man was killed, and the people have differed, so what do you say? He said: If you reject [him], then sit down with me. He said: So, he held one of them by the chest and said: I heard the Messenger of Allah (s) say: “Abu’l Yaqthan (Ammar) is on the natural disposition (fitra)” – three times – “he will not leave it until he dies.”