Commentaries:
Barnes' Notes
As birds flying - This is another comparison indicating substantially the same thing as the former, that Yahweh would protect Jerusalem. The idea here is, that He would do it in the same manner as birds defend their young by hovering over them, securing them under their wings, and leaping forward, if they are suddenly attacked, to defend them. Our Saviour has used a similar figure to indicate his readiness to have defended and saved the same city Matthew 23:27, and it is possible that he may have had this passage in his eye. The phrase ' birds flying,' may denote the "rapidity" with which birds fly to defend their young, and hence, the rapidity with which God would come to defend Jerusalem; or it may refer to the fact that birds, when their young are attacked, fly, or flutter around them to defend them; they will not leave them.
And passing over - pâsoach . Lowth renders this, ' Leaping forward.' This word, which is usually applied in some of its forms to the Passover Exodus 12:13, Exodus 12:23, Exodus 12:27; Numbers 9:4; Joshua 5:11; II Chronicles 30:18, properly means, as a verb, "to pass over," and hence, to preserve or spare. The idea in the passage is, that Yahweh would protect Jerusalem, as a bird defends its young.
Other Barnes' Notes entries containing Isaiah 31:5:
Exodus 12:11
2 Kings 18:29-30
Isaiah 33:14
Isaiah 38:6
Zechariah 11:6
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