Deuteronomy 32:3-5

3 For I will proclaim the name of the LORD; ascribe greatness to our God!

4 "The Rock, his work is perfect, for all his ways are justice. A God of faithfulness and without iniquity, just and upright is he.

5 They have dealt corruptly with him; they are no longer his children because they are blemished; they are a crooked and twisted generation.