Musar על יומא 150:17

To what may this be compared? To [the instance of] a king, who reigned over several hundreds of provinces and ruled over his kingdom with an abundance of strength and splendor, who had the wherewithal to sustain all the places of his rule and all the princes and appointees under him with an abundance of glory and strength. And afterwards there were found some individuals in one city, very few in number, who, in their haughtiness rebelled against the king. And the matter was reported to the king. And while they were yet deliberating the punishment of the rebels, the king went in the morning to promenade in his garden, where he heard a bird of beautiful form and voice singing and bade one of his attendants to take it immediately on that day and put it in his palace so that he could always enjoy it; and he did so. As he was taking it to the king's palace, it began to sing in a sweet beautiful voice — whereupon one of the fools said: "Beautiful bird, how much I would love to see you [always] and hear your beautiful song, and how great my sorrow when I bring to mind the great sorrow that will befall you. For whence will come your food now that we have heard that there are rebels against the king?" And the king's attendant answered: "You fool, with such a king — who reigns over several hundreds of provinces and numberless treasures — will the bird, whose appearance the king enjoys and whose song he rejoices in, have to worry about the few grains it needs for its sustenance because it is found in the province of a little city where one or two rebels have been found?" So, upon reflection, is it, exactly, in our case, a fortiori, many thousandfold: The Holy One Blessed be He, has created this world, the material world, and the higher world. And it is known that in the higher world many worlds are contained, almost without limit. But, as a whole, they are considered three worlds: the world of formation [olam hayetzirah], the world of the angels; above it, the world of creation [olam habriah]; and, above all, the world of Splendor [olam ha'atziluth], where the splendor of the Blessed One's holiness is found. As Chazal have said: "About this, Scripture states (Isaiah 43:7): 'All that is called by My Name [olam ha'atziluth] and which I have created for My glory [olam habriah, where the Throne of Glory is found] — I have formed it [olam hayetzirah, where are found the holy creatures (chayyoth hakodesh) seen by the prophet Yechezkel, and all the world of the angels] — I have also fashioned it [this world and all of the spheres].'" And it is known that this world and all of its spheres are as nothing compared to olam hayetzirah, for there [in the olam hayetzirah] are found classes of angels without limit. And in each class are found angels almost without number, as it is written in Daniel 7:10: "A thousand thousands serve Him. Ten thousand ten thousands stand before Him," about which Chazal have said (Chagigah 13b): "All this, in one class, and the classes are infinite, as it is written (Iyyov 25:3): 'Is there a number to His troops?'" And we find in Tanna d'bei Eliyahu 31 that 496,000 ten thousands of ministering angels sanctify the name of the Holy One Blessed be He always. From the rising of the sun until its setting, they say: "Holy, Holy, etc." And from its setting until its rising: "Blessed is the glory, etc." And it is known that all of the creations, even the highest of the highest, all require the Divine effluence, as it is written (Nechemiah 9:6): "You have made the heavens, the heavens of the heavens, and all their hosts, and You vivify all of them." But the effluence of their sustenance is not like ours. For it is rarefied, spiritual sustenance. As it is written (Psalms 78:25): "The food of the mighty did a man eat," concerning which Chazal have said: "This is the 'bread' [i.e., the Divine effluence] that the ministering angels 'feed' upon."

The line 18,7) ,ואל הבקר רץ אברהם) may be understood as parallel to the heavenly meat that the angels are reported as having fried for אדם הראשון, as reported in Sanhedrin 59. Abraham prepared the bread but did not serve it, since the time for manna which would be ground for the righteous in the heavenly region called שחקים was not yet ripe. Since Adam, however, had already been the recipient of meat from the heavenly regions before he sinned, Abraham saw no reason not to offer meat to these guests from heaven. The bread he prepared assumed a sacred character, seeing Abraham had been feeding the poor at all times, and the reason his descendants were found worthy to feed on heavenly bread was because of their ancestor Abraham's mercy. Unfortunately, the Israelites sinned when they made derogatory comments about the manna, describing it as לחם הקלקל, "bread that is lacking in substance" (Numbers 21,5). This heavenly bread will only appear again in the future that we have spoken of. The reason that