Matthew 10:13

If the house be worthy. — The doubt implied in the “if” seems at first somewhat inconsistent with the supposition that they only went into the house after having ascertained the worthiness of the occupant. It must be remembered, however, that the missionaries entered each city or village as strangers, and that in such a case even the most careful inquiry might not always be successful.

Let your peace come upon it — i.e., the peace implied in the formula of salutation. The imperative is not so much a command addressed to them as the proclamation of an edict from the King in whose name they went. Their greeting was not to be a mere ceremonious form. It would be as a real prayer wherever the conditions of peace were fulfilled on the other side. At the worst, the prayer for peace would bring a blessing on him who prayed.