Surah At-Tawbah, ayah 42

لَوۡ كَانَ عَرَضٗا قَرِيبٗا وَسَفَرٗا قَاصِدٗا لَّٱتَّبَعُوكَ وَلَٰكِنۢ بَعُدَتۡ عَلَيۡهِمُ ٱلشُّقَّةُۚ وَسَيَحۡلِفُونَ بِٱللَّهِ لَوِ ٱسۡتَطَعۡنَا لَخَرَجۡنَا مَعَكُمۡ يُهۡلِكُونَ أَنفُسَهُمۡ وَٱللَّهُ يَعۡلَمُ إِنَّهُمۡ لَكَٰذِبُونَ ٤٢

Law kāna 'aradan qarīban wasafaran qāsidal lattaba'ūka walākim ba'udat 'alayhimush-shuqqatu wasayahlifūna billāhi lawistata'nā lakharajnā ma'akum yuhlikūna anfusahum wallāhu ya'lamu innahum lakādhibūn

Had it been a near [i.e., easy] gain and a moderate trip, they [i.e., the hypocrites] would have followed you, but distant to them was the journey. And they will swear by Allāh,⁴⁸¹ "If we were able, we would have gone forth with you," destroying themselves [through false oaths], and Allāh knows that indeed they are liars.