63:3 dhaalika bi an-nahum aamanuu thum-ma kafaruu fa Tubi'A 'Alaa quluubihim fahum laa yafqahuun

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Ahmed Raza Khan: Mohammed Aqib Qadri:
That is because they accepted faith with their tongues then disbelieved with their hearts, therefore their hearts were sealed - so now they do not understand anything.

Yusuf Ali:
That is because they believed, then they rejected Faith: So a seal was set on their hearts: therefore they understand not.

Pickthal:
That is because they believed, then disbelieved, therefore their hearts are sealed so that they understand not.