Psalms 37 31
God's law lives in their minds, so they will not slip from his way.
Compare with other 3 random translations
LSV Psalms 37:31The law of his God is his heart, his steps do not slide.
NCV Psalms 37:31The teachings of their God are in their heart, so they do not fail to keep them.
NAS Psalms 37:31The Law of his God is in his heart; His steps do not slip.