He who does everything with proper balance and harmony.
“We shall set up scales of justice for the Day of Judgment, so that NOT A SOUL WILL BE DEALT WITH UNJUSTLY IN THE LEAST. And if there be (no more than) the weight of a mustard seed, We will bring it (to account): and enough are We to take account.”
(21:47)The Holy Quran
From the root q-s-t with the classical Arabic connotations: to act justly, equitably to do away with injustice to establish an equitable balance.