A.T. Robertson Commentary Hebrews 11:38

"(of whom the world was not worthy), wandering in deserts and mountains and caves, and the holes of the earth." — Hebrews 11:38 (ASV)

Of whom the world was not worthy (ων ουκ ην αξιος ο κοσμος) Graphic picture in a short parenthetical relative clause (ων, genitive plural with αξιος), a phrase to stir the blood of the readers.

Wandering (πλανωμενο). Present middle participle of πλαναω, like lost sheep, hunted by wolves.

Caves (σπηλαιοις). Old word from σπεος (cavern) as in Mt 21:13.

Holes (οπαις). Old word, perhaps from οπς (root of οραω, to see), opening, in N.T. only here and Jas 3:11. Cf. 1 Kings 18:4; II Macc. 5:27; 10:6 (about Judas Maccabeus and others).