John Gill Commentary Matthew 2:5

"And they said unto him, In Bethlehem of Judaea: for thus it is written through the prophet," — Matthew 2:5 (ASV)

And they said unto him
They answer without any hesitation, it being a generally received notion, and a thing well known among them,

in Bethlehem of Judea ;
and give their reason for it; for

thus it is written by the prophet ,
that is, the prophet Micah, in whose prophecy, (Micah 5:2) it stands, and is as follows: