Ibn ‘Umar reported God’s Messenger as saying, “God show mercy to a man who prays four rak'as before the afternoon prayer!” Ahmad, Tirmidhi and Abu Dawud transmitted it.
Reported by Abu Dawud (No. 1271), At-Tirmidhi (No. 430) and Ahmad (No. 5708). Cited in Mishkat al-Masabih (No. 1170).
‘Abdullāh ibn ‘Umar (may Allah be pleased with him) reported that the Messenger of Allah (may Allah's peace and blessings be upon him) said: "May Allah have mercy on whoever offers four Rak‘ahs before the ‘Asr prayer."