Deuteronomy 32:4 in the World English Bible
The Rock: his work is perfect, for all his ways are just. A God of faithfulness who does no wrong, just and right is he.
Context
3 Because I will publish the name of the LORD: ascribe ye greatness unto our God.
4 He is the Rock, his work is perfect: for all his ways are judgment: a God of truth and without iniquity, just and right is he.
5 They have corrupted themselves, their spot is not the spot of his children: they are a perverse and crooked generation.