Where did I say spoke?
The NT was written in Greek and it is the final covenant.
But since you asked the entire area had been under Hellenic rule prior to Roman rule. You are also aware that the reason for the rabbinical school at Jamnnia to disregard the Septuagint was that hey felt the Hebrew/ Aramaic language was being lost. They also discarded the NT precisely because (among other things) it was written in Greek.
No, the NT is no covenant; it is a collection of epistles, and of accounts of Yeshua’s Earthly ministry.
The covenants are all described in the ancient Hebrew scriptures, and Yeshua’s spilled blood is the fulfillment of the promised renewal of the covenant of Sinai in sinless blood of a man.
.