Didn’t Jesus say he was not here to replace the laws set forth in the Old Testament?
Jesus says He is the fulfillment of the law (Matt. 5:17.) He introduced a New Covenant (Luke 22:20) that doesn't destroy the law, but completes it. Hebrew sacrifices were not nullified by the death of Christ; they found their fulfillment in His death.
If the sense of "obeying God" counts as an ethic or whatever.
Most relevant passages:
9 The next day as Cornelius’s messengers were nearing the town, Peter went up on the flat roof to pray. It was about noon, 10 and he was hungry. But while a meal was being prepared, he fell into a trance. 11 He saw the sky open, and something like a large sheet was let down by its four corners. 12 In the sheet were all sorts of animals, reptiles, and birds. 13 Then a voice said to him, “Get up, Peter; kill and eat them.”
14 “No, Lord,” Peter declared. “I have never eaten anything that our Jewish laws have declared impure and unclean.[a]”
15 But the voice spoke again: “Do not call something unclean if God has made it clean.”
7 If the first covenant had been faultless, there would have been no need for a second covenant to replace it. 8 But when God found fault with the people, he said:
“The day is coming, says the Lord,
when I will make a new covenant
with the people of Israel and Judah.
9 This covenant will not be like the one
I made with their ancestors
when I took them by the hand
and led them out of the land of Egypt.
They did not remain faithful to my covenant,
so I turned my back on them, says the Lord.
10 But this is the new covenant I will make
with the people of Israel on that day,[c] says the Lord:
I will put my laws in their minds,
and I will write them on their hearts.
I will be their God,
and they will be my people.
11 And they will not need to teach their neighbors,
nor will they need to teach their relatives,[d]
saying, ‘You should know the Lord.’
For everyone, from the least to the greatest,
will know me already.
12 And I will forgive their wickedness,
and I will never again remember their sins.”[e]
13 When God speaks of a “new” covenant, it means he has made the first one obsolete. It is now out of date and will soon disappear.
And for additional context:
Before the coming of this faith,[j] we were held in custody under the law, locked up until the faith that was to come would be revealed. 24 So the law was our guardian until Christ came that we might be justified by faith. 25 Now that this faith has come, we are no longer under a guardian.
26 So in Christ Jesus you are all children of God through faith, 27 for all of you who were baptized into Christ have clothed yourselves with Christ. 28 There is neither Jew nor Gentile, neither slave nor free, nor is there male and female, for you are all one in Christ Jesus. 29 If you belong to Christ, then you are Abraham’s seed, and heirs according to the promise.
The 28th verse of this passage is the most famous, but the "law" being referred to here is the Old Testament law. This along with the context of the other verses is essentially saying that law is now fully obsolete and repealed and the new covenant is for all people, Jews and Gentiles, and that that previous distinction no longer matters. (This is because in the early church where most of the members were converts from Judaism, a lot of them held that being a Christian was still something only "for" Jews, that it was the fulfillment of the Jewish covenant but still didn't apply to outsiders. Paul swatted that down and stated the new Covenant applied to ALL people and the Jew/Gentile distinction was now fully obsolete and the Christians were not from a Jewish background were just as valid.)
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