تُؤْمِنُونَ بِاللَّهِ وَرَسُولِهِ وَتُجَاهِدُونَ فِي سَبِيلِ اللَّهِ بِأَمْوَالِكُمْ وَأَنفُسِكُمْ ۚ ذَٰلِكُمْ خَيْرٌ لَّكُمْ إِن كُنتُمْ تَعْلَمُونَ (11)
(61:11) It is that you should believe in Allah and His Messenger, *15 and should exert your utmost in Allah's Way with your wealth and your selves. This would be best for you if you only knew. *16
*15) When the believers are asked to believe, it automatically gives the meaning that they should become sincere Muslims: they should not rest content with oral profession of the Faith but should be ready and willing to make every sacrifice in the cause of their Faith.
*16) That is, this bargain is far superior for them to every worldly bargain.