Didache 16:5
4 As lawlessness grows, people will hate, persecute, and betray each other. The world's deceiver will appear as the Son of God, performing miracles, and unprecedented iniquities will be committed. 5 Humanity will face a fiery trial, and many will fall away. But those who remain steadfast in faith will be saved from under the curse. 6 Then, the signs of truth will appear: the sign in Heaven, the sound of the trumpet, and the resurrection of the dead.
4 Ezra 6:25
2 Esdras24 At that time friends shall make war on friends as though they were enemies, and the earth and all its inhabitants shall be terrified. Running streams shall stand still; for three hours they shall cease to flow. 25 ‘Whoever is left after all that I have foretold, he shall be preserved, and shall see the deliverance that I bring and the end of this world of mine. 26 They shall all see the men who were taken up into heaven without ever knowing death. Then shall men on earth feel a change of heart and come to a better mind.
Notes and References
"... A similar instance my occur in Didache 16:5 ... compare Matthew 24:13, Mark 13:13, Matthew 10:22. it can be argued that the parallel is not by itself very significant. The language is not unusual in such an eschatological context (compare Daniel 12:12; 4 Ezra 6:25), though the verbal agreement between these texts and the Didache is not as close as that between the Didache and Matthew/Mark. Whether the verse in Mark is part of Mark’s Vorlage is debatable. But whatever its origins, the parallel here provides another instance of the Didache showing verbal links with material which Matthew shares with Mark ..."
Gregory, Andrew F. The Reception of the New Testament in the Apostolic Fathers (p. 115) Oxford University Press, 2005