בראשית א:כ פירוש: רש״י, רשב״ם, ספורנו ושד״ל

נפש חיה LIVING CREATURES — Creatures that shall have vitality.

יעופף על הארץ, even though its creation originated from the waters, it would grow to maturity on earth.

יעופף על הארץ על פני רקיע השמים, in order to cleanse the air of the atmosphere for the benefit of the inhabitants of the earth from any excessive moisture in the air which had resulted through the creation of the rakia on the second “day.”