 <translate> To answer this question, we should know that: The mainstream consensus is that the New Testament was written in a form of Koine Greek, which was the common language of the Eastern Mediterranean from the Conquests of Alexander the Great (335 -- 323 BC) until the evolution of Byzantine Greek (c. 600).
So, the final answer is a form of Koine Greek. <yor> Láti dáhùn ìbéèrè yìí, a gbọ́dọ̀ mọ̀ pé: Èrò tó gbòde kan ni pé a kọ Májẹ̀mú Tuntun ní oríṣi èdè Koine Greek, èyí tí ó jẹ́ èdè tí ó wọ́pọ̀ ní Ìlà Oòrùn Mẹditaréníà láti ìgbà Ìṣẹ́gun Alẹkisáńdà Ńlá (335 - 323 Ṣ.K.) títí di ìgbà tí èdè Byzantine Greek (c. 600) ní ọdún tó kọjá. Nítorí náà, ìdáhùn tá a rí ni pé ọ̀kan lára èdè Gíríìkì tí wọ́n ń pè ní Koine ni. 