Matthew 17-19

What Peter, James, and John witnessed on the mountain of transfiguration is recorded at the beginning of chapter 17. I wonder how long it took for the apostles to realize who the two men speaking with Jesus were? Did Jesus introduce them? Did they understand who they were by God's prompting in their minds? Moses was the lawgiver and he represented to words of the Torah. Elijah was the great prophet who symbolized the accumulated writings of all the prophets. But God wanted the future leaders of his church to listen to Jesus.  And he said so in. Verse 5.
It took me about 15 minutes in two sessions to read this passage.
Stuart