And they shall bear the punishment of their iniquity: the punishment of the prophet shall be even as the punishment of him that seeketh unto him;

Jamieson-Fausset-Brown Bible Commentary

10. As they dealt deceitfully with God by seeking answers of peace without repentance, so God would let them be dealt with deceitfully by the prophets whom they consulted. God would chastise their sin with a corresponding sin; as they rejected the safe directions of the true light, He would send the pernicious delusions of a false one; prophets would be given them who should re-echo the deceitfulness that already wrought in their own bosom, to their ruin [Fairbairn]. The people had themselves alone to blame, for they were long ago forewarned how to discern and to treat a false prophet (De 13:3); the very existence of such deceivers among them was a sign of God's judicial displeasure (compare in Saul's case, 1Sa 16:14; 28:6, 7). They and the prophet, being dupes of a common delusion, should be involved in a common ruin.

Matthew Henry's Concise Commentary

14:1-11 No outward form or reformation can be acceptable to God, so long as any idol possesses the heart; yet how many prefer their own devices and their own righteousness, to the way of salvation! Men's corruptions are idols in their hearts, and are of their own setting up; God will let them take their course. Sin renders the sinner odious in the eyes of the pure and holy God; and in his own eyes also, whenever conscience is awakened. Let us seek to be cleansed from the guilt and pollution of sins, in that fountain which the Lord has opened.