Psalms 53:3

King James Version (KJV)

Every one of them is gone back: they are altogether become filthy; there is none that doeth good, no, not one.

Albert Barnes
Notes on the Whole Bible

Every one of them is gone back - See the notes at Psalm 14:3. The only variation here in the two psalms is in the substitution of the word - סג sâg for סור sûr - words almost identical in form and in sense. The only difference in meaning is, that the former word - the word used here - means “to draw back,” or “to go back;” the other, the word used in Psalm 14:1-7, means “to go off, to turn aside.” Each of them indicates a departure from God; a departure equally fatal and equally guilty, whether people turn “back” from following him, or turn “aside” to something else. Both of these forms of apostasy occur with lamentable frequency.