Surah Al-Hujurat, Verse 15

إِنَّمَا ٱلۡمُؤۡمِنُونَ ٱلَّذِينَ ءَامَنُواْ بِٱللَّهِ وَرَسُولِهِۦ ثُمَّ لَمۡ يَرۡتَابُواْ وَجَٰهَدُواْ بِأَمۡوَٰلِهِمۡ وَأَنفُسِهِمۡ فِي سَبِيلِ ٱللَّهِۚ أُوْلَٰٓئِكَ هُمُ ٱلصَّٰدِقُونَ١٥

innamā l-mu'minūna alladhīna āmanū bil-lahi warasūlihi thumma lam yartābū wajāhadū bi-amwālihim wa-anfusihim fī sabīli l-lahi ulāika humu l-ṣādiqūna

The believers are only the ones who have believed in Allāh and His Messenger and then doubt not but strive with their properties and their lives in the cause of Allāh. It is those who are the truthful.