It is narrated from Hazrat Aisha (may Allah be pleased with her) that when the Prophet (peace and blessings be upon him) set out for the Battle of Badr, a man started following the Prophet (peace and blessings be upon him) and caught up with him at Jamrah. He said, "I am going to participate in the battle with you." The Prophet (peace and blessings be upon him) asked him, "Do you believe in Allah and His Messenger?" He said, "No." The Prophet (peace and blessings be upon him) said, "Then we do not take help from any polytheist." He repeated the same thing again, and the Prophet (peace and blessings be upon him) asked the same question. This time he replied in the affirmative, and then he set out with the Prophet (peace and blessings be upon him).