Uthman performed a prostration in Surah Sad.
حدثنا عبد الله حدثني سويد بن سعيد حدثنا إبراهيم بن سعد عن ابن شهاب
أن عثمان رضي الله عنه سجد في ص
No references are available.
Its chain of transmission is sahih. It appears in Majma al-Zawaid 2/285, where it is stated, "Its narrators are the narrators of the Sahih." This hadith and the one after it are among the additions of Abdullah bin Ahmad.