كتاب الصلاة
2  
The Book of Prayer
Bulugh al-Maram 311
I saw the Prophet (ﷺ) placing his knees (on the ground) before his hands when he prostrated. [Reported by al-Arba'ah].
{ رَأَيْتُ رَسُولَ اَللَّهِ ‏- صلى الله عليه وسلم ‏-إِذَا سَجَدَ وَضَعَ رُكْبَتَيْهِ قَبْلَ يَدَيْهِ } أَخْرَجَهُ اَلْأَرْبَعَةُ .‏ 1
Reference : Bulugh al-Maram 311
In-book reference : Book 2, Hadith 311
English translation : Book 2, Hadith 309
Bulugh al-Maram 311
The first Hadith has a Shahid (supporting evidence) in the Hadith
فَإِنْ لِلْأَوَّلِ شَاهِدًا مِنْ حَدِيثِ :
Reference : Bulugh al-Maram 311
In-book reference : Book 2, Hadith 311
Hadith Text
Reference