At-Tawbah 9:42

لَوۡ كَانَ عَرَضٗا قَرِيبٗا وَسَفَرٗا قَاصِدٗا لَّٱتَّبَعُوكَ وَلَٰكِنۢ بَعُدَتۡ عَلَيۡهِمُ ٱلشُّقَّةُۚ وَسَيَحۡلِفُونَ بِٱللَّهِ لَوِ ٱسۡتَطَعۡنَا لَخَرَجۡنَا مَعَكُمۡ يُهۡلِكُونَ أَنفُسَهُمۡ وَٱللَّهُ يَعۡلَمُ إِنَّهُمۡ لَكَٰذِبُونَ 42

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