The one who is All-Knowing of His servants and sufficient for those who put their trust in Him. The one who recompenses His servants with either good or bad based upon His wisdom and knowledge of the finest details of their actions.
“When you are greeted with a greeting, greet in return with what is better than it or at least return it equally. Allah is Hasib of all things.”
[an-Nisa' (4): 86]
“Those who convey the Message of Allah and fear Him and none save Him, sufficient is Allah as Hasib.”
[al-Ahzab (33): 39]
From “Explanation to the Beautiful and Perfect Names of Allah” — Shaykh as-Sa’di (d.1376H)