Another interpretation is that "upon them the birds of the sky shall dwell" refers to the nations of the world who gather against Israel and subjugate them, in order to distance them from God. Nevertheless, they do not abandon God, as it is said, "From among the eagles, their voice will be heard." And they declare His unity twice a day with the recitation of the Shema: "Hear, O Israel: The Lord our God, the Lord is one." (Deuteronomy 6:4)
Growing grass. Rabbi Yaakov bar Acha, Rabbi Nechemia, and the Rabbis [dispute this]. Rabbi Nechemia says: "See the language that the Sages established in the blessing of Hamotzi, that it refers to bringing forth bread from the earth." The Rabbis say that this refers to when barley will grow from the earth, as it says, "Let there be a handful of grain in the earth, on the top of the mountains; its fruit shall rustle like the Lebanon" (Psalms 72:16), and "Bread for the eater shall be produced from the earth" (Isaiah 55:10). Rabbi Yitzchak said: "We find three places where bread is mentioned in the context of sustenance: with Abraham, as it is written, 'And I will fetch a morsel of bread, and you shall sustain your heart' (Genesis 18:5); with the Levite in Judges, as it is written, 'Sustain your heart with a morsel of bread' (Judges 19:5); and here, where it says, 'bread of the human heart shall sustain'."