Surah Al-Baqarah Verse 8

وَمِنَ النَّاسِ مَنْ يَقُولُ آمَنَّا بِاللَّهِ وَبِالْيَوْمِ الْآخِرِ وَمَا هُمْ بِمُؤْمِنِينَ

And of the people are some who say, "We believe in Allah and the Last Day," but they are not believers