lol. Why don't you tell that to Jesus, who DID use that phrase.
Do you think Jesus just made that up on the fly, something that would be totally unfamiliar with the people He was teaching? Really?
Why don't you check with the manuscripts that have been found that date back to the SECOND Century.
Those who are called "theologians and scholars" certainly know HOW to check that rumor out. That they still make their claim only demonstrates that they aren't as scholarly as some think.
Of course not. And that is precisely the point. Jesus was telling a real account of 3 real people who were already dead and in the afterlife in Hades. He was giving us a glimpse of the afterlife before the resurrection.
Since EVERY Jew would have been very familiar with the name of Abraham, describing where Lazarus was would have indicated to the Jews that Lazarus was in Paradise, where Jesus told the one thief he would be when he died. "Today, you will be WITH ME in Paradise".
So even though the phrase isn't in the OT, naming Abraham would show everyone that the poor man was a believer in the Messiah, while the rich man wasn't.