Mishkat al-Masabih #959
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
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.
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About Mishkat al-Masabih
This hadith is #959 from Mishkat al-Masabih, in the Book of Prayer.