And they that did eat were four thousand men, besides women and children.
All Commentaries on Matthew 15:38 Go To Matthew 15
Hilary of Poitiers
AD 368
As that first multitude which He fed answers to the people among the Jews that believed; so this is compared to the people of the gentiles, the number of four thousand denoting an innumerable number of people out of the four quarters of the earth.
Or, they spend the whole time of the Lord’s passion with the Lord; either because when they should come to baptism, they would confess that they believed in His passion and resurrection; or, because through the whole time of the Lord's passion they are joined to the Lord by fasting in a kind of union of suffering with Him.
The multitudes sit down on the ground; for before they had not reposed on the works of the Law, but they had supported themselves on their own sins, as men standing on their feet.