Surah Al-Baqara, Verse 111
وَقَالُوا۟ لَن يَدْخُلَ ٱلْجَنَّةَ إِلَّا مَن كَانَ هُودًا أَوْ نَصَٰرَىٰ ۗ تِلْكَ أَمَانِيُّهُمْ ۗ قُلْ هَاتُوا۟ بُرْهَٰنَكُمْ إِن كُنتُمْ صَٰدِقِينَ
Translation — Sahih International
And they say, "None will enter Paradise except one who is a Jew or a Christian." That is [merely] their wishful thinking, Say, "Produce your proof, if you should be truthful."
Source
Kur'an-ı Kerim, Bakara Suresi 2:111
https://kuran.diyanet.gov.tr/mushaf/kuran-meal-2/2-suresi-111-ayet