As birds flying, so will the lord of hosts defend Jerusalem. Isaiah 31:5.
With hurrying wing the mother bird hastens up to the protection of her young. She wastes no time upon the road when coming to supply them with food or guard them from danger. Thus as on eagle’s wings will the Lord come for the defense of His chosen; yea, He will ride upon the wings of the wind.
With outspread wing the mother covers her little ones in the nest. She hides them away by interposing her own body. The hen yields her own warmth to her chicks and makes her wings a house, in which they dwell at home. Thus doth Jehovah Himself become the protection of His elect. He Himself is their refuge, their abode, their all.
As birds flying and birds covering (for the word means both), so will the Lord be unto us: and this He will be repeatedly and successfully. We shall be defended and preserved from all evil: the Lord who likens Himself to birds will not be like them in their feebleness, for He is Jehovah of hosts. Let this be our comfort, that almighty love will be swift to succor and sure to cover. The wing of God is more quick and more tender than the wing of a bird, and we will put our trust under its shadow henceforth and forever.
Charles H Spurgeon