I've heard many equate baptism with circumcision as the sign of the New Covenant. However, I think I must take exception to this.
We have no record that Jesus' glorified body exhibited any wounds save those on His hands and side. These wounds remain as the sign of the New Covenant and remind us of His sacrifice.
When we observe the Lord's supper, we're reminded of His body and blood which were sacrificed for us. When we are baptized, we also die with Him by faith and are raised with Him.
"But He was wounded for our transgressions, He was bruised for our iniquities; The chastisement for our peace was upon Him, And by His stripes we are healed." Isaiah 53:5
We have no record that Jesus' glorified body exhibited any wounds save those on His hands and side. These wounds remain as the sign of the New Covenant and remind us of His sacrifice.
When we observe the Lord's supper, we're reminded of His body and blood which were sacrificed for us. When we are baptized, we also die with Him by faith and are raised with Him.
"But He was wounded for our transgressions, He was bruised for our iniquities; The chastisement for our peace was upon Him, And by His stripes we are healed." Isaiah 53:5