of Genesis,) in the tenor of the covenant made with Abraham, that circumcision was to distinguish his posterity, to the end of time.

It is called "an everlasting covenant" to be kept by his posterity through all their generations.

See the ch.

where the condition of the covenant is, that God would give to Abraham and his posterity, the perpetual inheritance of the promised land with whatever privileges were implied in his being their God, on condition that their male children were circumcised in testimony of putting themselves under that covenant.

There is no limitation with respect to time; nay it is expressly said that the covenant should be perpetual.
The ordinance of the Passover is also said to be perpetual, Ex.