Uthman was killed on the middle day of Tashriq.
حدثنا عبد الله حدثني عبيد الله بن معاذ حدثنا معتمر بن سليمان قال قال أبي
أن عثمان رضي الله عنه قتل في أوسط أيام التشريق
No references are available.
Its isnad is sahih. The father of Mutamir is Sulayman bin Tarkhan Taymi. Abu Uthman is Nahdi, and the report is found in Majma al-Zawaid (2/232–233), where he said, "Its narrators are the narrators of the Sahih," and it is among the additions of Abdullah bin Ahmad.