The word(s) "ويكفر" appears in 4 verse(s) in Quran.

(1) وَإِذَا قِيلَ لَهُمْ آمِنُوا بِمَا أَنزَلَ اللَّهُ قَالُوا نُؤْمِنُ بِمَا أُنزِلَ عَلَيْنَا وَيَكْفُرُونَ بِمَا وَرَاءَهُ وَهُوَ الْحَقُّ مُصَدِّقًا لِّمَا مَعَهُمْ ۗ قُلْ فَلِمَ تَقْتُلُونَ أَنبِيَاءَ اللَّهِ مِن قَبْلُ إِن كُنتُم مُّؤْمِنِينَ

(سورة البقرة, Al-Baqara, Chapter #2, Verse #91)
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(2) إِن تُبْدُوا الصَّدَقَاتِ فَنِعِمَّا هِيَ ۖ وَإِن تُخْفُوهَا وَتُؤْتُوهَا الْفُقَرَاءَ فَهُوَ خَيْرٌ لَّكُمْ ۚ وَيُكَفِّرُ عَنكُم مِّن سَيِّئَاتِكُمْ ۗ وَاللَّهُ بِمَا تَعْمَلُونَ خَبِيرٌ

(سورة البقرة, Al-Baqara, Chapter #2, Verse #271)
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(3) يَا أَيُّهَا الَّذِينَ آمَنُوا إِن تَتَّقُوا اللَّهَ يَجْعَل لَّكُمْ فُرْقَانًا وَيُكَفِّرْ عَنكُمْ سَيِّئَاتِكُمْ وَيَغْفِرْ لَكُمْ ۗ وَاللَّهُ ذُو الْفَضْلِ الْعَظِيمِ

(سورة الأنفال, Al-Anfaal, Chapter #8, Verse #29)
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(4) لِّيُدْخِلَ الْمُؤْمِنِينَ وَالْمُؤْمِنَاتِ جَنَّاتٍ تَجْرِي مِن تَحْتِهَا الْأَنْهَارُ خَالِدِينَ فِيهَا وَيُكَفِّرَ عَنْهُمْ سَيِّئَاتِهِمْ ۚ وَكَانَ ذَ‌ٰلِكَ عِندَ اللَّهِ فَوْزًا عَظِيمًا

(سورة الفتح, Al-Fath, Chapter #48, Verse #5)
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