﴿ وَمِنَ ٱلنَّاسِ مَن يَقُولُ ءَامَنَّا بِٱللَّهِ وَبِٱلْيَوْمِ ٱلْءَاخِرِ وَمَا هُم بِمُؤْمِنِينَ ﴾

“And there are people who say, "We do believe in God and the Last Day," the while they do not [really] believe.”

Please check ayah 2:9 for complete tafsir.