Comentario citado sobre Jeremías 3:21

He also shows how unwarranted was his [Job's] complaint that God hides things from mankind, not informing them of their sins; where they had gone astray (Jeremiah 3:21) and for which He punishes their disobedience with a rod (Psalms 89:33). For He had revealed heavenly information to him previously in dreams and visions. For it is by means of true dreams that He opens men’s ear (Job 33:16) informing them of their iniquity and what the future holds for them. He also makes this known to them through sickness and affliction, for these are all messages that God sends to man in order to return him from his wicked path, that he might live (Jeremiah 26:3 et alia).

וילך שפי, “He went alone.” Ibn Ezra, quoting Onkelos, says that the word שפי means “alone,” Other commentators understand the word as meaning “at an angle,” i.e. that Bileam was limping and could not walk upright. They derive this from Job 33,21 ושפי עצמותיו לא ראו, “that (from the context) up until then the deformity of his bones had not become visible.” The correct interpretation of the verse is that it parallels Jeremiah 3,21 קול על שפיים נשמע בכי, ”a sound is heard on the bare heights, weeping, etc.” The word אל, “to,” in front of שפי is missing here.