Nahjul Balagha Instructions 56

When Ameerul Momineen  placed Shurayh ibn Hani (al- Madhhiji) at the head of the vanguard preceding towards Syria, he issued this document of instruction to him.

Fear Allah every morning and evening and remain apprehensiveabout yourself of this deceitful world and do not regard it safe in any case. Know that if for fear of some evil you do not refrain yourself from things which you love, then passions will fling you into a lot of harm. Therefore, be for yourself a refrainer and protector, and for your anger a suppressor and killer.