Hadith 235

Bulugh al-Maram

Book 2: The Book of Prayer
Hadith 235
وَفِي رِوَايَةٍ لِلْبُخَارِيِّ : { فَلْيُتِمَّ , ثُمَّ يُسَلِّمْ , ثُمَّ يَسْجُدْ } .‏ 1‏
And in the narration of al-Bukhari:

'he should complete (the prayer) then he should say Taslim and then perform the prostration'.