a Esai. 51:6. Heb. נסְלָדוּ, all but an ἅπαξ λεγόμενον, LXX ἐστερεώθησαν. The allusion seems to be to the most durable nature of our firmament, composed as it is to the eye of the most yielding materials: like a settled canopy of bright smoke or vapour: See Job 26:7, 8; 37, 18; St. Cyril Alex. in loc. Esai. “When ye marvel, saith he, at the Heaven, how it is established, yet hath, to the eye, the nature of smoke; then know that things brought into being will be dissolved again.” Opp. ed. Aubert. ii. 707 C.