"15 Perceiving then that they were about to come and take him by force to make him king, Jesus withdrew again to the mountain by himself.
16 When evening came, his disciples went down to the sea, 17 got into a boat, and started across the sea to Capernaum. It was now dark, and Jesus had not yet come to them. 18 The sea became rough because a strong wind was blowing. 19 When they had rowed about three or four miles, they saw Jesus walking on the sea and coming near the boat, and they were frightened. 20 But he said to them, “It is I; do not be afraid.” 21 Then they were glad to take him into the boat, and immediately the boat was at the land to which they were going."
John 6:15-21
We may look at one or two further points in the story of the walking on the water before passing to the next verses. One very important consideration is concealed by the AV translation of Jesus' words in 20, 'It is I; be not afraid'. In the Greek, the words are, 'I am; be not afraid'. John has certainly recorded this with a deep sense of the significance of their meaning. It is earlier in this same chapter that Jesus makes the first of His superlative claims with these words in them, 'I am the bread of life'. The disciples, steeped as they were in the tradition of the Old Testament Scriptures, must surely have been conscious of the association of these words with the revelation God gave of Himself to Moses at the burning bush. To have used the mighty and mysterious words that were sacred to the name of Jehovah could have meant only one thing to them: it was another assertion of Deity.
Some commentators suggest that another miracle is involved in 21b. To come immediately to land when they were twenty-five furlongs away, more than suggests something supernatural. Others suggest an association of ideas with Psalm 107:9, 10 - the similarity is almost too striking to be coincidental - and, if so, the implication once again is that Jesus is God, for it is of God that the Psalm speaks. John's gospel is full of hidden claims and assertions about the Godhead of Christ.