﴿ تُؤْمِنُونَ بِٱللَّهِ وَرَسُولِهِۦ وَتُجَٰهِدُونَ فِى سَبِيلِ ٱللَّهِ بِأَمْوَٰلِكُمْ وَأَنفُسِكُمْ ۚ ذَٰلِكُمْ خَيْرٌۭ لَّكُمْ إِن كُنتُمْ تَعْلَمُونَ ﴾

“You are to believe in God and His Apostle, and to strive hard in God's cause with your possessions and your lives: this is for your own good - if you but knew it!”

Please check ayah 61:13 for complete tafsir.