Commentaries:
Jamieson, Fausset, and Brown
Bildad regards Job as a righteous man, who has fallen into sin.
God will not cast away a perfect man--(or godly man, such as Job was), if he will only repent. Those alone who persevere in sin God will not help (Hebrew, "take by the hand," Psalms 73:23; Isaiah 41:13; Isaiah 42:6) when fallen.
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