It is narrated from Hazrat Bara’ (may Allah be pleased with him) that in the beginning, this verse of the Holy Qur’an was revealed:“Those among the Muslims who sit (without participating in jihad) and those who strive in the way of Allah are not equal.”The Holy Prophet (peace and blessings be upon him) called Hazrat Zaid (may Allah be pleased with him) and instructed him, so he brought a shoulder bone and wrote this verse on it. Upon this, Hazrat Ibn Umm Maktum (may Allah be pleased with him) complained about his blindness, so the words“except those who are disabled”were further revealed in this verse.