Imagery of God's Protection
על כנפי נשרים UPON EAGLES’ WINGS — as an eagle which bears its fledglings upon its wings. Scripture uses this metaphor because all other birds place their young between their feet since they are afraid of another bird that flies above them, but the eagle fears none except man — apprehending that perhaps he may cast an arrow at it — since no bird can fly above it; therefore he places it (its young) upon its wings, saying, “Better that the arrow should pierce me than my young!” (Mekhilta d'Rabbi Yishmael 18:4:3). — “I, too”, said God, “did thus”: (Exodus 14:19, 20) “And the angel of God … journeyed etc…. And he came between the camp of Egypt etc.” … and the Egyptians were casting arrows and stone missiles and the cloud caught these (cf. Rashi on these verses).
Like an eagle who rouses his nestlings,
Gliding down to his young,
So did He spread His wings and take him,
Bear him along on His pinions;
יפרש כנפיו יקחהו [AS AN EAGLE …] SPREADETH ABROAD ITS WINGS, TAKETH IT — When it comes to remove them (the young) from one place to another, it does not take them with its claws, as other birds do: because other birds are afraid of the eagle that soars so high and flies above them, therefore they carry them (the young) by their (the mother’s) claws for fear of the eagle. But the eagle is afraid only of an arrow, therefore it carries them (the young) on its wings, saying, “It is better that the arrow pierce me than that it should pierce my young”.
Imagery of Bird Songs as Prayers or Words
גַּ֣ם בְּמַדָּֽעֲךָ֗ מֶ֚לֶךְ אַל־תְּקַלֵּ֔ל וּבְחַדְרֵי֙ מִשְׁכָּ֣בְךָ֔ אַל־תְּקַלֵּ֖ל עָשִׁ֑יר כִּ֣י ע֤וֹף הַשָּׁמַ֙יִם֙ יוֹלִ֣יךְ אֶת־הַקּ֔וֹל וּבַ֥עַל (הכנפים) [כְּנָפַ֖יִם] יַגֵּ֥יד דָּבָֽר׃
Don’t revile a king even among your intimates.
Don’t revile a rich man even in your bedchamber;
For a bird of the air may carry the utterance,
And a winged creature may report the word.
Hillel says: "... and do not say a thing which cannot be heard, which can be heard in the end [i.e., let your words not be ambiguous ones, which cannot be understood in the beginning, at first hearing, assuming that if the hearer analyzes them, in the end he will understand them. For this will lead people to mistake your words and possibly to come to heresy because of you. Alternately: Do not reveal your secret, even between you and yourself, saying that there is no one here to hear you, for in the end it will be heard, "for a bird of heaven will carry the voice, etc." (Koheleth 10:20).