And when they shall say to you, Seek to them that are mediums, and to wizards that peep, and that mutter: {u} should not a people seek to their God? for the {x} living to the dead?

(u) Answer the wicked thus, should not God's people seek comfort only from him?

(x) That is, will they refuse to be taught by the prophet, who is the mouth of God, and seek help from the dead, which is the illusion of Satan?

Wesley's Notes

8:19 And when they - The Israelites, who are fallen from God, into superstition and idolatry. You - My children, whom the prophet arms against the common temptation. Mutter - That speak with a low voice, as these two words signify, which they affected to do, speaking rather inwardly in their bellies, than audibly with their mouths. Should not - This answer the prophet puts into their mouths, doth not every nation, in cases of difficulty, seek to their gods? Much more should we do so, that have the only true God for our God. For the living - That is, for living men to enquire of the living God, is proper and reasonable; but it is highly absurd for them to forsake him, and to seek dead idols, either to the images, or to the spirits of dead men, which are supposed to speak in them.

Jamieson-Fausset-Brown Bible Commentary

19. Seek unto-Consult in your national difficulties.

them . familiar spirits-necromancers, spirit charmers. So Saul, when he had forsaken God (1Sa 28:7, &c.), consulted the witch of En-dor in his difficulties. These follow in the wake of idolatry, which prevailed under Ahaz (2Ki 16:3, 4, 10). He copied the soothsaying as he did the idolatrous "altar" of Damascus (compare Le 20:6, which forbids it, Isa 19:3).

wizards-men claiming supernatural knowledge; from the old English, "to wit," that is, know.

peep-rather "chirp faintly," as young birds do; this sound was generally ascribed to departed spirits; by ventriloquism the soothsayers caused a low sound to proceed as from a grave, or dead person. Hence the Septuagint renders the Hebrew for "necromancers" here "ventriloquists" (compare Isa 29:4).

mutter-moan.

should not, &c.-The answer which Isaiah recommends to be given to those advising to have recourse to necromancers.

for the living, &c.-"should one, for the safety of the living, seek unto (consult) the dead?" [Gesenius]. Lowth renders it, "In place of (consulting) the living, should one consult the dead?"

Matthew Henry's Concise Commentary

8:17-22 The prophet foresaw that the Lord would hide his face; but he would look for his return in favour to them again. Though not miraculous signs, the children's names were memorials from God, suited to excite attention. The unbelieving Jews were prone to seek counsel in difficulties, from diviners of different descriptions, whose foolish and sinful ceremonies are alluded to. Would we know how we may seek to our God, and come to the knowledge of his mind? To the law and to the testimony; for there you will see what is good, and what the Lord requires. We must speak of the things of God in the words which the Holy Ghost teaches, and be ruled by them. To those that seek to familiar spirits, and regard not God's law and testimony, there shall be horror and misery. Those that go away from God, go out of the way of all good; for fretfulness is a sin that is its own punishment. They shall despair, and see no way of relief, when they curse God. And their fears will represent every thing as frightful. Those that shut their eyes against the light of God's word, will justly be left to darkness. All the miseries that ever were felt or witnessed on earth, are as nothing, compared with what will overwhelm those who leave the words of Christ, to follow delusions.