Jeremiah 31:​27 And it shall come to pass, that just as I have watched over them, to pluck up, and to pull down, and to break down, and to destroy, and to afflict; so will I watch over them, to build, and to plant, said the LORD. ​28 In those days they shall say no more, The fathers have eaten sour grapes, and the children’s teeth are set on edge.​29 But every one shall die for his own iniquity; every man who eats sour grapes, his teeth shall be set on edge.​30 Behold, the days come, says the LORD, that I will make a new covenant with the house of Israel, and with the house of Judah;​ 31 Not according to the covenant that I made with their fathers in the day that I took them by the hand to bring them out of the land of Egypt; my covenant which they broke, although I was their master, says the LORD; 32 But this shall be the covenant that I will make with the house of Israel; After those days, says the LORD, I will put my Torah in their inward parts, and write it in their hearts; and will be their God, and they shall be my people.​33 And they shall teach no more every man his neighbor, and every man his brother, saying, Know the LORD; for they shall all know me, from the least of them to the greatest of them, says the LORD; for I will forgive their iniquity, and I will no longer remember their sin.

This prophecy is not about Jesus, it still remains unfulfilled. Verse 32 states the details of this new covenant with Israel and Judah (not the church). The difference in the covenants is that in the new covenant, God will put the Torah into the inward parts of the people of Israel and Judah and write it on their hearts, which contrasts with the former covenant where they had to learn and study. There is nothing in this prophecy that says the laws have changed. The biggest clue  that this prophecy is about the future and hasn’t been fulfilled is in verse 33 where it says that the people will not need to teach each other to know God because everyone will know God. This clearly has not been fulfilled yet, people still have to teach each other to know God.