Fighting for the Cause of Allah (Jihaad)

Bukhari :: Book 4 :: Volume 52 :: Hadith 200

Narrated Anas:

The Prophet offered a four-Rak'at Zuhr prayer at Medina and then offered a two Rak'at 'Asr prayer at Dhul-Hulaifa and I heard the companions of the Prophet reciting Talbiya aloud (for Hajj and 'Umra) altogether.