Deuteronomy 29:14

Neither with you only do I make this covenant and this oath;

The binding oath and agreement were not confined to those standing in the assembly on that day. They embraced those who were absent at the time and reached forward to include later generations. Their obligation therefore extended beyond the immediate gathering to bind those who came afterward.

The agreement is entered anew with the Lord rather than left as a past transaction. That renewal requires obstinacy of heart to be put away.