Not graded
Bulugh al-Maram 349
Narrator:Abd ar-Rahman ibn Awf
وَعَنْ عَبْدِ اَلرَّحْمَنِ بْنِ عَوْفٍ - رضى الله عنه - قَالَ : { سَجَدَ اَلنَّبِيُّ - صلى الله عليه وسلم -فَأَطَالَ اَلسُّجُودَ , ثُمَّ رَفَعَ رَأْسَهُ وَقَالَ :
" إِنَّ جِبْرِيلَ آتَانِي , فَبَشَّرَنِي , فَسَجَدْت لِلَّهِ شُكْرًا"
Narrated 'Abdur-Rahman bin 'Auf (RA):
The Prophet (ﷺ) prostrated and prolonged the Sajda, he then raised his head and said, "Jibrael (Gabriel) had come and given me glad tidings, thereafter I prostrated in gratitude to Allah." [Ahmad reported it and al-Hakim graded it Sahih (authentic)].
Cited in Bulugh al-Maram (No. 349).