Matthew 17:2

New English Translation

²And he was transfigured before them.^[a] His^[b] face shone like the sun, and his clothes became white as light.

Matthew 17:2 sn In 1st century Judaism and in the NT, it was believed that the righteous would be given new, glorified bodies in order to enter heaven (cf. 1 Cor 15:42-49; 2 Cor 5:1-10). This transformation meant that the righteous will share the glory of God. The account of Jesus’ transfiguration here recalls the way Moses shared the Lord’s glory after his visit to the mountain in Exod 34:28-35. So the disciples saw Jesus transfigured, and they were getting a private preview of the great glory that Jesus would have following his exaltation.
Matthew 17:2 tn Here καί (kai) has not been translated.

New English Translation (NET)