He did not depend upon his own judgment in reading the character of his guests. By his tent a tree was planted, which spread its branches out over all who believed in God, and afforded them shade. But if idolaters went under the tree, the branches turned upward, and cast no shade upon the ground. Whenever Abraham saw this sign, he would at once set about the task of converting the worshippers of the false gods. And as the tree made a distinction between the pious and the impious, so also between the clean and the unclean. Its shade was denied them as long as they refrained from taking the prescribed ritual bath in the spring that flowed out from its roots, the waters of which rose at once for those whose uncleanness was of a venial character and could be removed forthwith, while others had to wait seven days for the water to come up. Accordingly, Abraham bade the three men lean against the trunk of the tree. Thus he would soon learn their worth or their unworthiness.[137] Being of the truly pious, "who promise little, but perform much,"[133] Abraham said only: "I will fetch a morsel of bread, and comfort ye your heart, seeing that ye chanced to pass my tent at dinner time. Then, after ye have given thanks to God, ye may pass on."[139] But when the meal was served to the guests, it was a royal banquet, exceeding Solomon's at the time of his most splendid magnificence. Abraham himself ran unto the herd, to fetch cattle for meat. He slaughtered three calves, that he might be able to set a "tongue with mustard" before each of his guests.[140] In order to accustom Ishmael to God-pleasing deeds, he had him dress the calves,[141] and he bade Sarah bake the bread. But as he knew that women are apt to treat guests niggardly, he was explicit in his request to her. He said, "Make ready quickly three measures of meal, yea, fine meal." As it happened, the bread was not brought to the table, because it had accidentally become unclean, and our father Abraham was accustomed to eat his daily bread only in a clean state.[142] Abraham himself served his guests, and it appeared to him that the three men ate. But this was an illusion. In reality the angels did not eat,[143] only Abraham, his three friends, Aner, Eshcol, and Mamre, and his son Ishmael partook of the banquet, and the portions set before the angels were devoured by a heavenly fire.[144] Although the angels remained angels even in their human disguise, nevertheless the personality of Abraham was so exalted that in his presence the archangels felt insignificant.[145]