Our fathers ate the manna in the wilderness. As it is written, 'He gave them bread out of heaven{Greek and Hebrew use the same word for "heaven", "the heavens", "the sky", and "the air".} to eat.'"
Bread from heaven - The word “heaven,” in the Scriptures, denotes often the region of the air, the atmosphere, or that region in which the clouds are. See Matthew 16:3; “The sky (heaven) is red and lowering.” Also Matthew 3:16; Luke 4:15; Luke 5:18. The Jews, as appears from their writings (see Lightfoot), expected that the Messiah would provide his followers with plenty of delicious food; and as Moses had provided for the Jews in the wilderness, so they supposed that Christ would make provision for the temporal wants of his friends. This was the sign, probably, which they were now desirous of seeing.