The New Covenant is closely associated with which key figure in the New Testament?

Jesus started the New Covenant at the Last Supper when He shared bread and wine with His disciples. He said the wine represented His blood, which would seal the new agreement between God and people.

While Peter and Paul taught about the covenant, and John prepared the way, Jesus is the one who established it through His death. His sacrifice made the covenant possible.

The New Covenant means God writes His law on our hearts, not just on stone tablets.