Quran 4:137 — Women (Al-Nesa')

Surely, those who believe, then disbelieve, then believe, then disbelieve, then plunge deeper into disbelief, GOD will not forgive them, nor will He guide them in any way.

[4:136] O you who believe, you shall believe in GOD and His messenger, and the scripture He has revealed through His messenger, and the scripture He has revealed before that. Anyone who refuses to believe in GOD, and His angels, and His scriptures, and His messengers, and the Last Day, has indeed strayed far astray.

[4:138] Inform the hypocrites that they have incurred painful retribution.