The covenant of circumcision that God made with Abraham in Genesis 17 was showing the spiritual circumcision inside the Tabernacle, in which a sinner laid hands on the sacrificial offering to pass over their sins and cut off the sins.
In other words, even in the covenant that God spoke to Abraham, the burnt offering and the grain offering were presupposed.
Today, we know and believe that God promised Abraham through circumcision that He would be God to him and his descendants,
and this was foretelling the truth of salvation in the sacrificial law of the Tabernacle, in which sins are passed over to the sacrificial offering by laying on of hands to cut off sins.

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