15 Jesus therefore knowing that they were going to come and seize him, that they might make [him] king, departed again to the mountain himself alone.
16 But when evening was come, his disciples went down to the sea, 17 and having gone on board ship, they went over the sea to Capernaum. And it had already become dark, and Jesus had not come to them, 18 and the sea was agitated by a strong wind blowing. 19 Having rowed then about twenty-five or thirty stadia, they see Jesus walking on the sea and coming near the ship; and they were frightened. 20 But he says to them, It is I: be not afraid. 21 They were willing therefore to receive him into the ship; and immediately the ship was at the land to which they went.
22 On the morrow the crowd which stood on the other side of the sea, having seen that there was no other little ship there except that into which his disciples had got, and that Jesus had not gone with his disciples into the ship, but [that] his disciples had gone away alone; 23 (but other little ships out of Tiberias came near to the place where they ate bread after the Lord had given thanks;) 24 when therefore the crowd saw that Jesus was not there, nor his disciples, they got into the ships, and came to Capernaum, seeking Jesus.
Matthew Henry's Commentary on John 6:15-24
Commentary on John 6:15-21
(Read John 6:15-21)
Here were Christ's disciples in the way of duty, and Christ was praying for them; yet they were in distress. There may be perils and afflictions of this present time, where there is an interest in Christ. Clouds and darkness often surround the children of the light and of the day. They see Jesus walking on the sea. Even the approaches of comfort and deliverance often are so mistaken, as to become the occasions of fear. Nothing is more powerful to convince sinners than that word, "I am Jesus whom thou persecutest;" nothing more powerful to comfort saints than this, "I am Jesus whom thou lovest." If we have received Christ Jesus the Lord, though the night be dark, and the wind high, yet we may comfort ourselves, we shall be at the shore before long.
Commentary on John 6:22-27
(Read John 6:22-27)
Instead of answering the inquiry how he came there, Jesus blamed their asking. The utmost earnestness should be employed in seeking salvation, in the use of appointed means; yet it is to be sought only as the gift of the Son of man. Him the Father has sealed, proved to be God. He declared the Son of man to be the Son of God with power.