Imam Sadiq (a.s) narrated that once when Imam Ali (a.s) had sent his servant to do something, he came back a little too late. Imam Ali (a.s) told him to rush, and he did. Then when he came to Imam Ali (a.s), Ameer al-Momineen (a.s) said
“I see no other way to be kind with you. Go you are free.”