We were at Uthman's door during the first ten days of Dhul-Hijjah.
حدثنا أبو نعيم حدثنا أبو خلدة
كنا بباب عثمان رضي الله عنه في عشر الأضحى
Its isnad is sahih, and it is a repetition of 548, except that this one is from the narration of the Imam, while that one is from the narration of his son Abdullah. It is found in Majma al-Zawaid 7/232, where it says, Ahmad narrated it, and its men are the men of the Sahih.