كتاب الصلاة
2  
The Book of Prayer
And in the narration of al-Bukhari:
'he should complete (the prayer) then he should say Taslim and then perform the prostration'.
وَفِي رِوَايَةٍ لِلْبُخَارِيِّ : { فَلْيُتِمَّ , ثُمَّ يُسَلِّمْ , ثُمَّ يَسْجُدْ } .‏ 1


‏1 ‏- صحيح .‏ رواه البخاري ( 1 /504 / فتح )‏ .‏

Sunnah.com reference : Book 2, Hadith 235
English translation : Book 2, Hadith 0
Arabic reference : Book 2, Hadith 335