Yes, it was a sign of the covenant between God and his people prior to Christ. Baptism replaces circumcision as a sign of the covenant between God and his people. His people are now not limited to believing Jews (it never was, anyone who came to faith in the Old Testament who was not an ethnic Jew could be circumcised into the covenant) but include as one of the Psalms states “a people yet unknown.” In other words, the Covenant extends to all believers and their households via baptism in the same manner that circumcision extended not just to Abraham but to his entire household.
News to me.
Where do I find this information?