Did according as the Lord commanded them; showing their repentance by their submission to God, and to Job for God's sake, and by taking shame to themselves. The Lord also accepted Job, both for his friends and for himself, as the next verse explains it.
Related Commentaries of Job 42:9
Job 42:9
9 So Eliphaz the Temanite and Bildad the Shuhite and Zophar the Naamathite went, and did according as the LORD commanded them: the LORD also accepted Job.b