As in our day and age with Wycliffe Bible Translators, Christians have been translating the Scriptures for almost 2,000 years. Christians translate the entire Word of God (both the Older Testament and the New) into the languages of the people they are trying to reach.
We have hundreds of copies of the entire Bible translated into many languages (including Syriac, Coptic, Latin, and, of course, Greek) that date within a few hundred years after Christ.
The oldest manuscript that contains both the Old Testament and the New Testament in one document is the Codex Sinaiticus which dates to 350AD.
When you compare Early Christian Translations of the Old Testament with the Masoretic Text and the rest of the manuscripts that serve as the basis for Bible translations today, they are virtually identical!