Allah's Messenger (S) said: "When he commits Hadath - meaning a man - and he is sitting in the end of his Salat before saying the Taslim, then his Salat is acceptable."
Jami` at-Tirmidhi Book 2, Hadith 261
← Previous Hadith Allah's Messenger (S) said: "Teach the boy Salat when he is seven years old, and beat him (if he does not pray) when he is ten."

Jami` at-Tirmidhi Book 2, Hadith 260 Next Hadith → "We were with the Prophet (S) on a journey when it started to rain on us, so the Prophet (S) said: 'Whoever wishes, let him perform Salat in his place.'"

Jami` at-Tirmidhi Book 2, Hadith 262