If I beheld the {r} sun when it shined, or the moon walking in brightness;

(r) If I was proud of my worldly prosperity and happiness, which is meant by the shining of the sun, and brightness of the moon.

Wesley's Notes

31:26 I - This place speaks of the worship of the host of heaven, and especially of the sun and moon, the most eminent and glorious of that number, which was the most ancient kind of idolatry, and most frequent in the eastern countries. Shined - In its full strength and glory.

King James Translators' Notes

sun: Heb. light

in...: Heb. bright

Jamieson-Fausset-Brown Bible Commentary

26. If I looked unto the sun (as an object of worship) because he shined; or to the moon because she walked, &c. Sabaism (from tsaba, "the heavenly hosts") was the earliest form of false worship. God is hence called in contradistinction, "Lord of Sabaoth." The sun, moon, and stars, the brightest objects in nature, and seen everywhere, were supposed to be visible representatives of the invisible God. They had no temples, but were worshipped on high places and roofs of houses (Eze 8:16; De 4:19; 2Ki 23:5, 11). The Hebrew here for "sun" is light. Probably light was worshipped as the emanation from God, before its embodiments, the sun, &c. This worship prevailed in Chaldea; wherefore Job's exemption from the idolatry of his neighbors was the more exemplary. Our "Sun-day," "Mon-day," or Moon-day, bear traces of Sabaism.

Matthew Henry's Concise Commentary

31:24-32 Job protests, 1. That he never set his heart upon the wealth of this world. How few prosperous professors can appeal to the Lord, that they have not rejoiced because their gains were great! Through the determination to be rich, numbers ruin their souls, or pierce themselves with many sorrows. 2. He never was guilty of idolatry. The source of idolatry is in the heart, and it corrupts men, and provokes God to send judgments upon a nation. 3. He neither desired nor delighted in the hurt of the worst enemy he had. If others bear malice to us, that will not justify us in bearing malice to them. 4. He had never been unkind to strangers. Hospitality is a Christian duty, 1Pe 4:9.