Allah (swt) says in the Quran: "The month of Ramaḍān [is that] in which was revealed...
The Koran narrates n'ụzọ ọrụ ebube na ihe omume nke kewara nke ọnwa nke a Allah-ekwu, sị, "Oge awa na-eru nso, na ọnwa na-gbawara n'etiti (na abụọ).