What part of these verses is a insertion by translators?

J was not a letter until 1500! In order to know we would have to look at the Hebrew Text. The Tanach is far older the the Apostolic scripture. The oldest Tanach manuscript in existence was the Lenigrad codex dated 916 CE. I think the Jehovah would be a further stay from what the Hebrew text would have been. In our common English versions it is hard to say what was inserted and why. In early Hebrew there were no vowels. If you even look at the English Bibles written before King James such as the Geneva and Cloverdale Bibles you will find total different names. In those versions Jesus had a Y sound at the head of his name,