4:137 in-nal-ladhiyna aamanuu thum-ma kafaruu thum-ma aamanuu thum-ma kafaruu thum-mazdaaduu kufral lam yakunil-laahu li yagfira lahum wa laa li yahdiyahum sabiylaa

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Ahmed Raza Khan: Mohammed Aqib Qadri:
Indeed those who believe, then disbelieve and then again believe, then again disbelieve, and go further in their disbelief - Allah will never forgive them, nor ever guide them to the path.

Yusuf Ali:
Those who believe, then reject faith, then believe (again) and (again) reject faith, and go on increasing in unbelief,- Allah will not forgive them nor guide them nor guide them on the way.

Pickthal:
Lo! those who believe, then disbelieve and then (again) believe, then disbelieve, and then increase in disbelief, Allah will never pardon them, nor will He guide them unto a way.