Surah Al-Mujadila 58:18

يَوْمَ يَبْعَثُهُمُ ٱللَّهُ جَمِيعًا فَيَحْلِفُونَ لَهُۥ كَمَا يَحْلِفُونَ لَكُمْ ۖ وَيَحْسَبُونَ أَنَّهُمْ عَلَىٰ شَىْءٍ ۚ أَلَآ إِنَّهُمْ هُمُ ٱلْكَـٰذِبُونَ

On the Day Allāh will resurrect them all, and they will swear to Him as they swear to you and think that they are [standing] on something. Unquestionably, it is they who are the liars.

Translation: Saheeh International

Tafsir

Mention the day when God will raise them all together whereupon they will swear to Him that they are believers just as they swear to you now and suppose that they are standing on something beneficial by swearing in Hereafter just as they supposed it to have been beneficial for them in this world. …

Excerpt from Tafsir al-Jalalayn, commentary on 58:18, via Quran.com. The reader has the full commentary and 9 more tafsirs.