Luke 24:44

And He said unto them, These are the words which I spake unto you, while I was yet with you, &c., i.e. that I was to suffer death upon the Cross and rise again the third day. Acknowledge Me then as the true Messiah, inasmuch as My words have been verified to the letter. Or by a metonomy these are the words, i.e. the things which I spake to you, My passion, death, and resurrection, which ye see accomplished. These things therefore ought not to appear to you strange and unexpected, for they were predicted, not only by me, but in time past by Moses, and the prophets, and by David in the Psalms concerning Me.

Some think that S. Luke wrote these words by anticipation, and that Christ spake them not on the day of His resurrection but on that of His ascension. For it was then that He bade the disciples remain in Jerusalem (Acts i. 4), as Luke records, verse 49, going on in the verses following to describe the ascension. But perhaps the words were used on both occasions, the oftener to impress them upon the Apostles for the greater confirmation of their faith.