Sahih Muslim Book 4, Hadith Number 1470.
Chapter : Compensation of the missed prayer and excellence of observing it promptly.
Anas b. Malik is reported to have said: I observed four rak’ahs in the noon prayer with the Messenger of Allah (may peace be upon him) at Medina, and said two rak’ahs in the afternoon prayer at Dhu’l-Hulaifa.