from the least to the greatest,
since I shall forgive their guilt and never more call their sins to mind.
By speaking of a new covenant, he implies that the first one is old.
And anything old and ageing is ready to disappear.
Hebrews 8:10–13
Note that God said “I will make (the covenant) with the House of Israel”. So, when He, Jesus, told the apostles to eat the bread (his body) and drink the wine (his blood), and said “this is the cup of blood, My new and everlasting covenant”, He (as God) was making the covenant. This was when He made his identity as God, known to them.