It is narrated from Hazrat Sahl (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Among you is the Book of Allah, which the black, red, and white will all learn. So learn it before the time comes when some people will learn it, but it will not go below their throats, and they will straighten it like an arrow, and instead of seeking its reward in the Hereafter, they will seek the world through it.