That is because they believed, and then disbelieved; so their hearts were sealed, and they cannot understand.
Al-Munafiqun 63:3
Compare 15 English translations
ذَٰلِكَ بِأَنَّهُمْ آمَنُوا ثُمَّ كَفَرُوا فَطُبِعَ عَلَىٰ قُلُوبِهِمْ فَهُمْ لَا يَفْقَهُونَ
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That is because they believed, and then disbelieved; so their hearts were sealed, and they cannot understand.
That's because they believed, then they stopped believing. So their hearts became closed, and now they don't understand.
That's because they first believed, then rejected faith. So their hearts have been sealed, and now they don't understand.
That is because they believed, then disbelieved, so their hearts were sealed and they do not comprehend.
That is because they believed and then disbelieved. So a seal was set upon their hearts, so they do not understand.
That is because they believed and then disbelieved. So a seal was set upon their hearts, so they do not understand.
That is because they believed, and then they disbelieved; so their hearts were sealed over, and they do not understand.
That is because they believed, and then disbelieved; therefore their hearts are sealed, so they understand not.
That is because they believed, then disbelieved; therefore their hearts have been sealed, so they do not understand.
That is because they believed, then they rejected Faith: So a seal was set on their hearts: therefore they understand not.
That is because they believed, then disbelieved, therefore their hearts are sealed so that they understand not.
that is because they believed and then rejected their faith: their hearts are sealed up, so that they are devoid of understanding.
All that is because they first believed and then disbelieved, and therefore a seal was set on their hearts; as a result they understand nothing.
That is because they believed and then disbelieved, so their hearts were sealed. Hence, they do not understand.
Thalika biannahum amanoo thumma kafaroo fatubiAAa AAala quloobihim fahum la yafqahoona