Mukhtasar Bukhari

Narrated from Sayyiduna Ibn Umar (may Allah be pleased with them) that Sayyiduna Umar bin Khattab (may Allah be pleased with him, his father) found two slave girls among the captives of Hunain and kept them in a house in Makkah. Then the Messenger of Allah (peace and blessings of Allah be upon him) ordered the captives of Hunain to be set free, so people started running in the streets. Sayyiduna Umar (may Allah be pleased with him) said to his son, "O Abdullah! See what this is?" He said, "The Messenger of Allah (peace and blessings of Allah be upon him) has set the captives of Hunain free (this is the reason)." Sayyiduna Umar (may Allah be pleased with him) said, "Go, you also set those two slave girls free." (These slave girls had come to him from the spoils of war.)