It is narrated from Sayyiduna Sahl bin Sa’d (may Allah be pleased with him) that on the day of Khaybar, the Messenger of Allah (peace and blessings be upon him) said:“Tomorrow I will hand over this flag to a man by whose hands Allah will grant victory. He loves Allah and His Messenger, and Allah and His Messenger love him.”The people spent the whole night wondering who among them would be given the flag. In the morning, the people came to the Messenger of Allah (peace and blessings be upon him), each hoping that he would be given the flag. The Messenger of Allah (peace and blessings be upon him) said:“Where is Ali bin Abi Talib?”The people replied:“O Messenger of Allah! His eyes are sore.”People were sent to bring him. When he was brought, the Messenger of Allah (peace and blessings be upon him) applied his saliva to his eyes and prayed for him. He was immediately cured as if he had never had any pain. Then the Prophet (peace and blessings be upon him) handed him the flag. He (Ali) said:“O Messenger of Allah! Should I fight them until they become like us (i.e., Muslims)?”The Prophet (peace and blessings be upon him) said:“Proceed calmly until you reach them. Then first invite them to Islam and inform them of the rights of Allah upon them in Islam. By Allah! If Allah guides a single man through you, it is better for you than red camels.”