Woe on those who reject him. The parallel passage, Luke 10:12-15, comes almost at the close of the commission to the seventy. It is represented in the commission reported by St. Matthew by Matthew 10:15 alone, which is almost verbally identical with Matthew 10:24.
It is possible that St. Matthew or the author of the source used by him did not care to interrupt the subject of Matthew 10:1-42. by inserting more of these verses there, even though that place more nearly represented their original position.
Observe that here they are connected with the rejection of John and of our Lord; in Luke, with the rejection of his disciples and of himself in them.