For the laity also the law required and prescribed cleanliness of clothing. Stuffs of two kinds might not be worn; pomegranates must be fixed on the corners of the robe. The field and vineyard might not be sown with two kinds of seed; nor could ox and ass be yoked together before the plough.[393] Certain animals were unclean, and these might not be eaten. The clean and permitted food was obtained from oxen, sheep, goats, and in wild animals from deer, wild-goats, and gazelles, and in fact from all animals which ruminate and have cloven feet. Unclean are all flesh-eating animals with paws, and more especially the camel, the swine, the hare, and the coney. Of fish, those only might be eaten which have fins and scales; all fish resembling snakes, like eels, might not be eaten. Most water-fowl are unclean; pigeons and quails, on the other hand, were permitted food. All creeping things, winged or not, with the exception of locusts, are forbidden.[394] Moreover, if the permitted animals were not slain in the proper manner their flesh was unclean; if it had "died of itself," or was strangled, or torn by wild beasts,[395] the use of the blood of the animal was most strictly forbidden, "for the life of all flesh is the blood;" even of the animals which might be eaten the blood must be poured on the earth and covered with earth.[396] As the eating of forbidden food made a man unclean, so also did all sexual functions of man or woman, and all diseases connected with these functions, including lying in child-bed. Every one was also unclean on whose body was "a rising scab or bright spot," but above all the white leprosy rendered the sufferer unclean.[397] Finally, any contact with the corpse of man or beast, whether intentional or accidental, rendered a man unclean. The house in which a man died, with all the utensils, was unclean; any one who touched a grave or a human bone was tainted.[398] The priestly regulations set forth in great detail the ceremonies, the washings and sacrifices, by which defilements were to be removed. The unclean person must avoid the sanctuary, and even society and contact with others, till the time of his purification, which in serious defilements can only begin after the lapse of a certain time. In the more grievous cases ordinary water did not suffice for the cleansing, but from the ashes of a red cow without blemish, which was slain as a sin offering and entirely burnt, the priest prepared a special water of purification with cedar wood and bunches of hyssop. The reception of healed lepers required the most careful preparations and most scrupulous manipulations.