kumayl ibn ziyad

Imam Ali a.s teaching Dua Kumayl :

Kumayl ibn Ziyad has related: Imam caught hold of my hand and took me to the graveyard. When he had passed through the graveyard and left the city behind, he breathed a deep sigh and said:

O’ Kumayl these hearts are containers. The best of them is that which preserves (its contents). So, preserve what I say to you.