Read and reflect on verse 1277 from Surah At-Tawba: Had there been [a prospect of] immediate gain, and an easy journey, they would certainly have followed thee, [O Prophet:] but the distance was too gre...
لَوْ كَانَ عَرَضًا قَرِيبًا وَسَفَرًا قَاصِدًا لَاتَّبَعُوكَ وَلَٰكِنْ بَعُدَتْ عَلَيْهِمُ الشُّقَّةُ ۚ وَسَيَحْلِفُونَ بِاللَّهِ لَوِ اسْتَطَعْنَا لَخَرَجْنَا مَعَكُمْ يُهْلِكُونَ أَنْفُسَهُمْ وَاللَّهُ يَعْلَمُ إِنَّهُمْ لَكَاذِبُونَ
Had there been [a prospect of] immediate gain, and an easy journey, they would certainly have followed thee, [O Prophet:] but the distance was too great for them. And yet, [after your return, O believers,] they will swear by God, "Had we been able to do so, we would certainly have set out with you!" - [and by thus falsely swearing] they will be destroying their own selves: for God knows indeed that they are lying!