Until his word came. The word of the Lord inflamed him.

“Not nature but foolishness makes the slave. Not manumission but learning makes a person free. Esau was born free, but he became a slave; Joseph was sold into slavery, but he was raised to power8 so that he might rule those who had purchased him. Yet he did not slight his obligation to work zealously; he clung to the heights of virtue; he preserved the liberty of innocence, the stronghold of blamelessness. So the psalmist beautifully says, "Joseph had been sold into slavery. They had bound his feet with fetters." "He had been sold into slavery," he says; he did not become a slave. They had bound his feet, but not his soul.How is his soul bound when he says, "The iron pierced his soul"? Although the souls of others were pierced with sin (iron is sin, because it pierces within), the soul of blessed Joseph did not lie open to sin but pierced through sin. He was not swayed by the beauty of his mistress's charms, and so he did not experience the flames of passion, for he was aflame with the greater flame of divine grace. Thus, it is said very aptly of him, "Because the word of the Lord burned him," and with this he quenched the fiery darts of the devil.”

“Next he doth relate the story, mentioning what Joseph suffered in his low estate, and how he was raised on high. "His feet they hurt in the stocks: the iron entered into his soul, until his word came" (ver. 18). That Joseph was put in irons, we do not indeed read; but we ought no ways to doubt that it was so. For some things might be passed over in that history, which nevertheless would not escape the Holy Spirit, who speaketh in these Psalms. We understand by the iron which entered into his soul, the tribulation of stern necessity; for he did not say body, but "soul." There is a somewhat similar expression in the Gospel, where Simeon saith unto Mary, "A sword shall pierce through thy own soul also." That is, the Passion of the Lord, which was a fall unto many, and in which the secrets of many hearts were revealed, since their sentiments respecting the Lord were extorted from them, without doubt made His own Mother exceeding sorrowful, heavily struck with human bereavement. Now Joseph was in this tribulation, "until his word came," with which he truly interpreted dreams: whence he was introduced to the king, that unto him also he might foretell what would happen in respect to his dreams. But since he said, "Until his words were heard," that we might not altogether so understand "his," that any one might think so great an event was to be ascribed unto man; he at once added, "The word of the Lord inflamed him" (ver. 19); or, as other copies have it more closely from the Greek, "The word of the Lord fired him," that he also might be reputed amongst those to whom it is said, "Receive ye praise in His holy Name."”

“Until His word came [The word] of the Holy One, blessed be He, to fulfill His decree that the matter should “roll” and Israel should descend to Egypt. the saying of the Lord purified him It tried Joseph, for he was tested and he overcame the temptation [to sin] with his master’s wife, and he was tortured because of her and purified with tortures to place him in the dungeon.”

“Until the time that his word came,.... Either the word of Joseph, interpreting the dreams of the butler and baker, till that came to be fulfilled; so the Syriac version, "till his word was proved by the event": or rather till the fame and report of that came to Pharaoh's ears, Gen 41:13, or else the word of the Lord, concerning his advancement and exaltation, signified in dreams to him, Gen 37:7, as it follows: the word of the Lord tried him: it tried his faith and patience before it was accomplished; and when it was, it purged him and purified him, as silver in a furnace, and cleared him of the imputation and calumny of his mistress; for, even in the view of Pharaoh, he appeared to be a man in whom the Spirit of God was, Gen 41:38. Some think that Christ, the essential Word, is intended, who came and visited him, tried and cleared him.”

“His word. By which he foretold his own glory, or what should befall the king’s two officers, which brought him into notice, Genesis xxxvii. 9., and xl. 22. His word, may also refer to God’s decree. (Calmet) — Inflamed him. He received the gift of prophecy, (Haydock) and being inflamed with the love of God, resisted the solicitations of Putiphar’s wife.”