John Gill Commentary Matthew 15:21

"And Jesus went out thence, and withdrew into the parts of Tyre and Sidon." — Matthew 15:21 (ASV)

Then Jesus went thence From the land of Gennesaret, after he had silenced the Pharisees, as to the charge brought by them against his disciples; and when he had reproved them for their hypocrisy and wickedness, in making void the commands of God by their traditions; and had explained some difficult and parabolical sayings he had made use of to his disciples.

He then left that country, and departed very privately: either to shun the multitude, for the sake of retirement; or to avoid any snares the Scribes and Pharisees might be laying for him, who must be greatly galled with his free discourse, and strong arguments:

and departed into the coasts of Tyre and Sidon; two principal cities of Phoenicia: not that he went into these places themselves, but into some places that bordered upon them; for as he ordered his disciples not to go in the way of the Gentiles, so neither did he himself.