John Lightfoot on Luke 24:13

[And behold two of them were going, &c.] One of these was Cleopas, verse 18, whom we have elsewhere shewn to be the very same with Alpheus, both from the agreement of the name, and also by comparing John 19:25, with Mark 15:47, and Matthew 27:56. That Peter was the other, I do not at all question, grounding my confidence upon verse 34 of this chapter; and 1 Corinthians 15:5. This Cleopas or Alpheus, we see, is the speaker here, and not Peter, being older than Peter, as being the father of four of the apostles.