I have not left anything...

The Prophet, sallAllaahu 'alayhi wa sallam, said, 

“I have not left anything which will bring you closer to Allaah except that I have ordered you with it.” 

[Reported by at-Tabaraani, authentic, refer to Asl Sifatis-Salaatin-Nabee, vol. 3, p. 942]