Dalil

Quran An-Nur 24:47

وَيَقُولُونَ ءَامَنَّا بِٱللَّهِ وَبِٱلرَّسُولِ وَأَطَعۡنَا ثُمَّ يَتَوَلَّىٰ فَرِيقٞ مِّنۡهُم مِّنۢ بَعۡدِ ذَٰلِكَۚ وَمَآ أُوْلَٰٓئِكَ بِٱلۡمُؤۡمِنِينَ

Translation

But they [i.e., the hypocrites] say, "We have believed in Allāh and in the Messenger, and we obey"; then a party of them turns away after that. And those are not believers.