Circumcision.

1 Corinthians 8:8
But food does not bring us closer to God: We are no worse if we do not eat, and no better if we do.

Romans 2:25-29
Circumcision has value if you observe the Law, but if you break the Law, your circumcision has become uncircumcision. . . .

Romans 3:30
since there is One God, who will justify the circumcised by faith and the uncircumcised through that same faith.

Galatians 5:6
For in Christ Jesus neither circumcision nor uncircumcision has any value. All that matters is faith, expressed through love.

Galatians 6:15
For neither circumcision nor uncircumcision means anything. What counts is a new creation.

but.

1 Samuel 15:22
But Samuel declared: "Does the LORD delight in burnt offerings and sacrifices as much as in obeying the voice of the LORD? Behold, obedience is better than sacrifice, and attentiveness is better than the fat of rams.

Jeremiah 7:22, 23
For when I brought your fathers out of the land of Egypt, I did not merely command them about burnt offerings and sacrifices, . . .

Matthew 5:19
So then, whoever breaks one of the least of these commandments and teaches others to do likewise will be called least in the kingdom of heaven, but whoever practices and teaches them will be called great in the kingdom of heaven.

John 15:14
You are My friends if you do what I command you.

1 John 2:3, 4
By this we can be sure that we have come to know Him: if we keep His commandments. . . .

1 John 3:22-24
and we will receive from Him whatever we ask, because we keep His commandments and do what is pleasing in His sight. . . .

1 John 5:2, 3
By this we know that we love the children of God: when we love God and keep His commandments. . . .

Revelation 22:14
Blessed are those who wash their robes, so that they may have the right to the tree of life and may enter the city by its gates.