Hazrat Zuhri (may Allah have mercy on him) narrates that Hazrat Saeed bin Musayyib (may Allah have mercy on him) said: The Noble Prophet (peace and blessings be upon him) gave the flag to Hazrat Ali (may Allah be pleased with him) and said: I am giving the flag to a person who loves Allah and His Messenger (peace be upon him), and Allah and His Messenger (peace be upon him) love him. Then the Prophet (peace be upon him) applied his saliva to both of his eyes because he was suffering from an eye ailment. And he prayed for him, so Allah granted him victory at Khaybar.