Sayyiduna Sa’d bin Abi Waqqas (may Allah be pleased with him) narrates: On the day of Badr, I killed Sa’id bin ‘As and took his sword (Dhul-Katifah). I came to the Messenger of Allah (peace and blessings be upon him) while my brother ‘Umayr had been killed. The Prophet (peace and blessings be upon him) said:“Put it in the spoils.”I returned, and my heart was filled with grief that my brother had been killed and the wealth was also taken away. I had not gone far when Surah Al-Anfal was revealed, so the Messenger of Allah (peace and blessings be upon him) called me and said:“Go and take your sword.”