Genesis 7:4

Forty days. — Henceforward forty became the sacred number of trial and patience, and, besides the obvious places in the Old Testament, it was the duration both of our Lord’s fast in the wilderness and of His sojourn on earth after the Resurrection.

Every living substance. — The word “living” is found neither in the Hebrew nor in the ancient versions, and limits the sense unnecessarily. The word is rare, being found only thrice, namely, here, in Genesis 7:23, and in Deuteronomy 11:6. It means whatever stands erect. Thus God “destroys” — Heb., blots out (see on Genesis 6:7) — not man and beast only, but the whole existent state of things — “from the face of the earth” — Heb., the adâmâh, the cultivated and inhabited ground. This section is much more limited in the extent which it gives to the flood, not including reptiles, or rather, small animals, among those saved in the ark, and confining the overflow of the waters to the inhabited region.