Sayyiduna Ibn Abbas (may Allah be pleased with them both) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Jibreel (peace be upon him) taught me one mode (harf), but I kept asking for more, so he kept granting me until it reached seven modes." Zuhri says: The meaning of seven modes is that as long as they remain in the same meaning, and there is no change in what is lawful and unlawful.