This conception introduced certain usages and customs, which were developed by the priests into a system of rules for purification and food. Herodotus says, "the Egyptians are the most religious of all men; they have a severe and strict service, and many sacred customs." The boys were circumcised. Beans, rye, and barley might not be eaten; the flesh of many animals and many kinds of fish was forbidden. It was not lawful to eat the head of any animal. The animals for sacrifice must first be examined by the priests, to see that they did not belong to the sacred kinds--to sacrifice these was an inexpiable offence--and whether in other respects they were without blemish and pleasing to the gods. This examination was the duty of the class of temple-servants already mentioned, and it devolved on them to mark the animals found to be clean with a seal, which in bulls was placed on the horns. The Egyptians never ate at the same table with strangers, nor used a cup from which a stranger had drunk, nor ate flesh cooked in the vessel of a stranger and cut with a stranger's knife; all strangers and their utensils were unclean. Nothing woollen might be taken into a temple or a tomb. The Egyptians always wore newly-washed under-clothing of linen; they were obliged frequently to wash their bodies, and for three days in each month they used means of evacuation, clysters and emetics, in order to cleanse the body internally.[277] These statements are confirmed by papyrus rolls containing medicinal precepts. If the king, a sacred animal, or a member of the family died, no one was allowed to wear white or bright-coloured clothes; he must shave his eyebrows, and abstain from intercourse with his wife and from baths. Men and women threw dust on their heads and faces, and the women ran to and fro wailing with bare breasts.[278] If an Egyptian had not committed murder, theft, or adultery, if he had not defamed the gods nor the king, nor those in authority over him, nor his own father, if he were not guilty of lying or slandering, if he had deceived neither gods nor men, nor oppressed his workmen in their daily tasks, nor drawn off the water, if he had allowed no one to be hungry, and caused no one to weep, if he were not slothful and idle in his occupation, if he sacrificed to the gods at the appointed time, and poured libations and observed all the regulations for cleanliness, then he might hope to find grace in the presence of the twenty-four judges before Osiris on the day of judgment in Amenti (p. 79). In order to gain by such conduct and careful observation of the laws of cleanliness and the ritual, a long life in this world, rest in the grave, and eternal life in the fields of the sun-god, the Egyptians worshipped their gods with unwearied zeal, while their kings raised temple upon temple of enormous blocks in honour of the life-giving powers of heaven.