لَا يَسْتَأْذِنُكَwould not ask your leave,to stay behind from Jihad,الَّذِينَ يُوْمِنُونَ بِاللّهِ وَالْيَوْمِ الاخِرِ أَن يُجَاهِدُواْ بِأَمْوَالِهِمْ وَأَنفُسِهِمْThose who believe in Allah and the Last Day, to be exempted from fighting with their properties and their lives.because they consider Jihad an act of worship. This is why when Allah called them to perform Jihad, they obeyed and hasten to act in His obedience,وَاللّهُ عَلِيمٌ بِالْمُتَّقِينَ