4:136 Believers, believe in Allah and His Messenger (Muhammad), in the Book He has sent down to His Messenger, and in the Book He sent down before. Whosoever disbelieves in Allah, His angels, His Books, His Messengers, and the Last Day, has surely gone astray into far error.
4:137 Those who believe, and then disbelieve, and then believe, and then disbelieve, and increase in disbelief Allah is not to forgive them nor guide them on a way.