Greek was the language of that day. Aramaic and Koine greek and Attic Greek are found in different books of the new testament in earliest manuscripts.
Old Testament, obviously in Hebrew, or the flaming language.
Interestingly, before I studied any Hebrew, I had dreams where Hebrew characters were presented to me as well as some in Greek and Aramaic. Go figure.
Since the originals are obviously not in existence, why do we assume the originals were in Greek and not in either Hebrew or Aramaic?