Mishkat al-Masabih 4 Prayer كتاب الصلاة 438

عَنْ عِمْرَانَ بْنِ حُصَيْنٍ: أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ صَلَّى بهم فَسَهَا فَسجدَ سَجْدَتَيْنِ ثُمَّ تَشَهَّدَ ثُمَّ سَلَّمَ. رَوَاهُ التِّرْمِذِيُّ وَقَالَ: هَذَا حَدِيثٌ حَسَنٌ غَرِيبٌ

‘Imran b. Husain said that the Prophet led them in prayer and forgot something, so he made two prostrations, then uttered the shahada , then gave the salutation. Tirmidhi transmitted it and said this is a hasan gharib tradition.