Surah At-Tawbah, ayah 44

9:44

لَا يَسۡتَـٔۡذِنُكَ ٱلَّذِينَ يُؤۡمِنُونَ بِٱللَّهِ وَٱلۡيَوۡمِ ٱلۡأٓخِرِ أَن يُجَٰهِدُواْ بِأَمۡوَٰلِهِمۡ وَأَنفُسِهِمۡۗ وَٱللَّهُ عَلِيمُۢ بِٱلۡمُتَّقِينَ ٤٤

Lā yasta'dhinukal-ladhīna yu'minūna billāhi wal-yawmil-ākhiri an yujāhidū bi amwālihim wa anfusihim wallāhu 'alīmu bil-muttaqīn

Those who believe in Allāh and the Last Day would not ask permission of you to be excused from striving [i.e., fighting] with their wealth and their lives. And Allāh is Knowing of those who fear Him.