Narrated Sahl bin Sa'd that he heard the Prophet (ﷺ) on the day (of the battle) of Khaibar saying, "I will give the flag to a person at whose hands Allâh will grant victory." So, the companions of the Prophet (ﷺ) got up, wishing eagerly to see to whom the flag will be given, and everyone of them wished to be given the flag. But the Prophet (ﷺ) asked for '. Someone informed him that he was suffering from eye-trouble. So, he ordered them to bring ' in front of him. Then the Prophet (ﷺ) spat in his eyes and his eyes were cured immediately as if he had never any eye-trouble. said, "We will fight with them (i.e. infidels) till they become like us (i.e. Muslims)." The Prophet (ﷺ) said, "Be patient, till you face them and invite them to Islâm and inform them of what Allâh has enjoined upon them. By Allâh ! If a single person embraces Islâm at your hands (i.e. through you), that will be better for you than the red camels." [4:192-O.B]