He feedeth {z} on ashes: a deceived heart hath turned him aside, that he cannot deliver his soul, nor say, Is there not a lie in my right hand?

(z) He is abused as one that would eat ashes, thinking to satisfy his hunger.

Wesley's Notes

44:20 Ashes - An unprofitable and pernicious food, and no less unsatisfying and mischievous is the worship of idols. Deceived heart - A mind corrupted and deceived by deep prejudice, gross error, and especially by his own lusts. Turned - From the way of truth. Deliver - From the snares and dangers of idolatry. Is there not - What is this idol which I set at my right - hand, as the true God is said in scripture to be at the right - hand of his people; which I highly honour, for the most honourable place was on the right - hand; to which I look for relief and assistance, which God in scripture is said to afford to his people, by being at and holding their right - hand. What, I say, is this idol? Is it not a lie, which tho' it pretends to be a god, yet, in truth is nothing but vanity and falsehood?

Jamieson-Fausset-Brown Bible Commentary

20. feedeth on ashes-figuratively, for the idolater delights in what is vain (Pr 15:14; Ho 12:1). "Feedeth on wind." There is an allusion, perhaps, also, to the god being made of a tree, the half of which was reduced to ashes by fire (Isa 44:15-17); the idol, it is implied, was no better, and could, and ought, to have been reduced to ashes like the other half.

deceived heart-The heart and will first go astray, then the intellect and life (Ro 1:28; Eph 4:18).

lie in . right hand-Is not my handiwork (the idol) a self-deceit?

Matthew Henry's Concise Commentary

44:9-20 Image-making is described, to expose the folly of idolaters. Though a man had used part of a log for fuel, he fell down before an image made of the remainder, praying it to deliver him. Man greatly dishonours God, when he represents him after the image of man. Satan blinds the eyes of unbelievers, causing absurd reasonings in matters of religion. Whether men seek happiness in worldly things, or run into unbelief, superstition, or any false system, they feed on ashes. A heart deceived by pride, love of sin, and departure from God, turns men aside from his holy truth and worship. While the affections are depraved, a man holds fast the lie as his best treasure. Are our hearts set upon the wealth of the world and its pleasures? They will certainly prove a lie. If we trust to outward professions and doings, as if those would save us, we deceive ourselves. Self-suspicion is the first step towards self-deliverance. He that would deliver his soul, must question his conscience, Is there not a lie in my right hand?