The Book of Prayer
Bulugh al-Maram #373
كتاب الصلاة
«رَأَيْتُ رَسُولَ اَللَّهِ - صلى الله عليه وسلم -إِذَا سَجَدَ وَضَعَ رُكْبَتَيْهِ قَبْلَ يَدَيْهِ» أَخْرَجَهُ اَلْأَرْبَعَةُ.
I saw the Prophet (ﷺ) placing his knees (on the ground) before his hands when he prostrated.
"رَأَيْتُ رَسُولَ اَللَّهِ - صلى الله عليه وسلم -إِذَا سَجَدَ وَضَعَ رُكْبَتَيْهِ قَبْلَ يَدَيْهِ" أَخْرَجَهُ اَلْأَرْبَعَةُ .
I saw the Prophet (ﷺ) placing his knees (on the ground) before his hands when he prostrated.
— Bulugh al-Maram, Hadith 373