A man from among the companions of the Prophet ﷺ reported that the Messenger of Allah ﷺ said, "Ammar has been filled with faith to the very marrow of his bones."
أخبرنا إسحق بن منصور وعمرو بن علي عن عبد الرحمن قال حدثنا سفيان عن الأعمش عن أبي عمار
عن رجل من أصحاب النبي ﷺ قال قال رسول الله ﷺ ملئ عمار إيمانا إلى مشاشه
[Hasan] Recorded by Hakim (3/392, 393) from the hadith of Abdul-Rahman bin Mahdi, with this chain. Abu Ammar is Arib bin Humayd Hamdani. The hadith has corroborating narrations in Ibn Majah (no. 147), Bazzar (Kashf Astar 3/251, 252), and others.