In Galatians 3:1, Paul likewise calls them foolish and bewitched, reinforcing the same rebuke against abandoning the gospel.

In Galatians 4:7-10, Paul warns against observing days and months—a concrete example of returning to fleshly perfection after starting by the Spirit.

In Galatians 5:4-8, Paul says those seeking justification by law have fallen from grace—showing the danger of turning from Spirit to flesh.

In Galatians 6:12-14, Paul exposes false teachers who compel circumcision to boast in the flesh—the same flesh reliance Paul questions.

Galatians 4:9 continues the theme of turning back to weak principles, mirroring the foolishness of beginning in Spirit and ending in flesh.

In Hebrews 7:16-19, the law made nothing perfect, and a better hope is introduced through Christ—explaining why fleshly perfection is futile.

In Hebrews 9:9, the law's gifts and sacrifices cannot perfect the conscience—directly paralleling Paul's point that the flesh cannot perfect.

In Hebrews 9:10, external regulations (food, drink) are imposed until reformation—showing the temporary, fleshly nature of law observances.