If he destroy him from his place, then it shall {k} deny him, saying, I have not seen thee.

(k) That is, so that there remains nothing there to prove whether the tree had grown there or not.

Wesley's Notes

8:18 He - God, who is the saviour of good men, and the destroyer of the wicked. It - The place; to which denying him, and seeing him, are here ascribed figuratively. Not seen - He shall be so utterly extirpated and destroyed, that there shall be no memorial of him left.

Jamieson-Fausset-Brown Bible Commentary

18. If He (God) tear him away (properly, "to tear away rapidly and violently") from his place, "then it [the place personified] shall deny him" (Ps 103:16). The very soil is ashamed of the weeds lying withered on its surface, as though it never had been connected with them. So, when the godless falls from prosperity, his nearest friends disown him.

Matthew Henry's Concise Commentary

8:8-19 Bildad discourses well of hypocrites and evil-doers, and the fatal end of all their hopes and joys. He proves this truth of the destruction of the hopes and joys of hypocrites, by an appeal to former times. Bildad refers to the testimony of the ancients. Those teach best that utter words out of their heart, that speak from an experience of spiritual and divine things. A rush growing in fenny ground, looking very green, but withering in dry weather, represents the hypocrite's profession, which is maintained only in times of prosperity. The spider's web, spun with great skill, but easily swept away, represents a man's pretensions to religion when without the grace of God in his heart. A formal professor flatters himself in his own eyes, doubts not of his salvation, is secure, and cheats the world with his vain confidences. The flourishing of the tree, planted in the garden, striking root to the rock, yet after a time cut down and thrown aside, represents wicked men, when most firmly established, suddenly thrown down and forgotten. This doctrine of the vanity of a hypocrite's confidence, or the prosperity of a wicked man, is sound; but it was not applicable to the case of Job, if confined to the present world.