What is the new covenant?A Scripture-grounded answer about what is the new covenant

The new covenant is God's promise to write his law on people's hearts, forgive their sins, and establish a permanent relationship with them through the sacrifice of Jesus Christ. Prophesied by Jeremiah and fulfilled by Christ, the new covenant replaces the old Mosaic covenant. At the Last Supper, Jesus took the cup and said, 'This cup is the new covenant in my blood.' The book of Hebrews argues extensively that the new covenant is superior to the old because it is founded on better promises, mediated by a better priest, and secured by a better sacrifice.