AL-HASEEB-The Reckoner, The Sufficient The Reckoning One

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Al-Haseeb is the Bringer to account of His slaves; He knows their deeds, their lifespans and all their affairs. He is the One Who is sufficient; He takes care of all His slaves. Al-Haseeb keeps record of all actions and then He will requite them according to His wisdom. The One who gives the satisfaction.
Allah, Exalted be He, says, “Allah is sufficient as a Reckoner.” (Surat An-Nisa’: 4:6)
This name means that Allah is aware of His slaves and will take account of their actions and reward them or punish them accordingly. It also means that He is sufficient for those who rely on Him, and that He is ever ready to provide protection and help to them.

Benefits of belief in this name include the following:

Showing total need for and dependence on Allah alone, fully aware that we are in constant need of Him, placing our trust in Allah after doing all that is required without thinking that means alone are sufficient to achieve our goals.
Fearing Allah, Glorified and Sublime be He, bringing ourselves to account before we are brought to account on the Day of Judgment, preparing for the Day of Reckoning by doing numerous acts of obedience to Allah, avoiding acts of disobedience to Him as well as wronging people.
Relying on Allah alone, for He is sufficient for us and He is the best protector.

The One who takes account of all actions and reckons them. The One who is the measurer and accountant of every deed.

The One who is sufficient to meet all needs. The One who gives what is sufficient and necessary in every situation.

From the root h-s-b which has the following classical Arabic connotations:

to reckon, number, count, calculate, compute, think
to give without sparing or scanting
to give without the receiver’s expectation
to suffice, to be sufficient, or without measure

This name is used in the Qur’ān. For example, see 4:86