Nabiyah says that Umar bin Ubaidullah bin Ma'mar had pain in his eyes. When he reached the place of Rauha, the pain increased. He sent a message to Aban bin Uthman, so Aban replied that Sayyiduna Uthman (may Allah be pleased with him) narrated that the Noble Prophet (peace and blessings be upon him) said: Tie a bandage of aloe vera (sabr) on both eyes.