Obligation of Jihad (striving in Allah's cause)

ٱنفِرُوا۟ خِفَافًا وَثِقَالًا وَجَـٰهِدُوا۟ بِأَمْوَٰلِكُمْ وَأَنفُسِكُمْ فِى سَبِيلِ ٱللَّهِ ۚ ذَٰلِكُمْ خَيْرٌ لَّكُمْ إِن كُنتُمْ تَعْلَمُونَ

Go forth, whether light or heavy, and strive with your wealth and your lives in the cause of Allāh. That is better for you, if you only knew.