Surah Al-Baqarah 2:14

وَإِذَا لَقُوا۟ ٱلَّذِينَ ءَامَنُوا۟ قَالُوٓا۟ ءَامَنَّا وَإِذَا خَلَوْا۟ إِلَىٰ شَيَـٰطِينِهِمْ قَالُوٓا۟ إِنَّا مَعَكُمْ إِنَّمَا نَحْنُ مُسْتَهْزِءُونَ

And when they meet those who believe, they say, "We believe"; but when they are alone with their evil ones, they say, "Indeed, we are with you; we were only mockers."

Translation: Saheeh International

Tafsir

When they meet laqū is actually laquyū but the damma has been omitted being too cumbersome for pronunciation; likewise the yā’ is omitted because it is unvocalised and is followed by a wāw; those who believe they say ‘We believe’; …

Excerpt from Tafsir al-Jalalayn, commentary on 2:14, via Quran.com. The reader has the full commentary and 9 more tafsirs.