I say to you!
Will not pass away
Until all these things
Have taken place.’”
ἀμὴν λέγω ὑμῖν ὅτι οὐ μὴ παρέλθῃ ἡ γενεὰ αὕτη ἕως ἂν πάντα ταῦτα γένηται.
This is exactly the same, word for word, in Mark, chapter 13:30, and in Luke, chapter 21:32. In a solemn proclamation (ἀμὴν λέγω ὑμῖν), Jesus said that this current generation would not pass away (ὅτι οὐ μὴ παρέλθῃ ἡ γενεὰ αὕτη) until all these things had taken place (ἕως ἂν πάντα ταῦτα γένηται). In other words, Jesus said that his disciples would live to see the end times, something that did not happen.