The practice of reading the New Testament and trying to find a corresponding or foundation saying in the Old Testament is not reliable, because Christ has many things to say and do that are uniquely his.
Just so no claim to authority rises to validity angels are out in front putting God’s business on the agenda for all people.
Looking for the Christ
We are better off applying that practice to apostolic sayings and their depiction of Messianic sayings and deeds. A lot of mistakes could have been avoided if we had been looking for the Christ in what anyone has to say about the kingdom of God. Thousands of books and preachers can be ignored because they do not present the Christ nor do they have a reputation for prioritizing his claim. This is reason to be joyful to the max.