for they did not understand about the loaves, but their hearts were hardened.
This passage of story we had Mat 14:22, etc., only what was there related concerning Peter, is omitted here. Here we have, I. The dispersing of the assembly; Christ constrained his disciples to go before by ship to Bethsaida, intending to follow them, as they supposed, by land. The people were loth to scatter, so that it cost him some time and pains to send them away.
Commenting on Mark 6:45-56
And when they had passed over,.... The lake of Gennesaret, or sea of "Galilee", they came into the land of Gennesaret; See Gill on Mat 14:34; to Capernaum, as appears from Joh 6:17 for Capernaum was in the land of Gennesaret; to which agrees what Josephus says, that the land of Gennesaret was watered with a very excellent spring, which the inhabitants of that place...
Verse 52. They considered not the miracle of the loaves. They did not remember or call to mind the power which Jesus had shown in feeding the five thousand by a miracle, and that, having done that, he had power also to save them from the storm. Their heart was hardened. Their mind was dull to perceive it.