1 Kings 13:7 - Joseph Benson’s Commentary on the Old and New Testaments

I will give thee a reward He desires to requite the instrument, but takes no notice of God, the chief cause and author of this wonderful mercy. The man of God said, I will not go in with thee, &c. In obedience to God, he refuses to eat, or drink, or have any familiar society with him, against whom he had pronounced God's indignation. For so it was charged me My refusal of thy favour is not from any contempt or hatred of thy person, but in compliance with the just command of my God, who hath forbidden me all further converse or communication with thee. Saying, Eat no bread, nor drink water Namely, in that place, or with that people. Hereby God showed his detestation of their idolatry, not because it was as bad as that of the heathen, but because they were vile apostates from the true God, and embraced this idol-worship against the light of their own consciences, merely to comply with the king's humour and command; and because their vicinity and relation to Judah, exposed that tribe to the danger of being infected by their idolatry. God also intended hereby to teach his people in all ages to have no fellowship with the unfruitful works of darkness, lest they should either give encouragement to, or receive infection from, them. Nor turn again by the same way thou earnest That by avoiding the way that led him to Beth-el as execrable, although he went by God's special command, he might teach all others how much they ought to abhor that way, and all thoughts of going to that place, or to such idolatrous people, upon any unnecessary occasion.