John 6:25

And when they had found Him on the other side of the sea, they said unto Him, Rabbi, when camest Thou hither?

On the morning after the miracle of the loaves there was great excitement and astonishment on the northeastern shore of the lake. The people that had remained in that neighborhood overnight, expecting to take hold of Jesus in the morning, were deeply perplexed. Only one boat had been at the place of the miraculous feeding, and that was the one into which the disciples had gone. This boat had not had Jesus as a passenger, and it had not returned. The question therefore was: How had Jesus gotten away? They were at a loss to explain His absence. But meanwhile other boats from Tiberius landed in the neighborhood of the place where the miracle had been performed. So the people took advantage of the opportunity thus offered. They were determined to find Jesus at all costs, and therefore they took some of the boats and crossed the lake to Capernaum. When they had finally located the object of their quest on the other side of the lake, they opened on Him with the question as to His manner of getting there, for the when includes the how. They were always scenting the abnormal, the miraculous, in connection with this man; it was the only thing which made their quest worthwhile, in their estimation. But the purposes of Jesus do not agree with their curiosity, and therefore He did not give them a direct answer. His telling of the walking on the water would have precipitated a crisis then and there.