Deuteronomy 32:4
3 For I will proclaim the name of the Lord; you must acknowledge the greatness of our God. 4 As for the Rock, his work is perfect, for all his ways are just. He is a reliable God who is never unjust, he is fair and upright. 5 His people have been unfaithful to him; they have not acted like his children—this is their sin. They are a perverse and deceitful generation.
Zephaniah 3:5
4 Her prophets are proud; they are deceitful men. Her priests have defiled what is holy; they have broken God’s laws. 5 The just Lord resides within her; he commits no unjust acts. Every morning he reveals his justice. At dawn he appears without fail. Yet the unjust know no shame. 6 “I destroyed nations; their walled cities are in ruins. I turned their streets into ruins; no one passes through them. Their cities are desolate; no one lives there.
Notes and References
"... In Zephaniah 3 the tone of the comparison is different, being much more positive. The first instance Roberts notes is in 3:5 'Yahweh (is) righteous ... he will not do iniquity'. This evokes the words of Deuteronomy 32:4 ... This is also from the song of Moses, where Moses reminds Israel of God’s character before lamenting over his people’s unfaithfulness ..."
Pearson, Susan Zephaniah: Plagiarist or Skilled Orator? (p. 46) SIL International, 2011