2 of 2 part series on "Codex Sinaiticus" The Oldest Bible? Or a Modern Hoax? By www.adullamfilms.com.  Thank You to Chris Pinto.  Most Modern translations base their New Testament on Codex Sinaiticus & Vaticanus.  These source texts are not earlier manuscripts and can't be trusted! This is just one of many reasons. The best source text for the New Testament is Textus Receptus, which English versions like Tyndale, LITV, KJV, NKJV, etc. use.