Epistles of Ignatius by Ignatius (A.D. 115) have correspondences in several places with the Gospels and seem to incorporate language from the Pauline letters.
(The Origin of the Bible: Newly Updated by F. F. Bruce, J. I. Packer, Philip W. Comfort, and Carl F. H. Henry, 2020. The Canon of the New Testament by Milton C. Fisher, Pages 68-72.)