Calves--mostly, if not always, bull-calves--were largely used for food in Palestine, and in the households of the wealthy were fatted for the table. See, for example, the familiar parable of the prodigal son, in which the rejoicing father is mentioned as preparing a great feast in honour of his son's return, and ordering the fatted calf to be killed--the calf in question being evidently one of the animals that were kept in good condition against any festive occasion. And, even in the earliest history of the Bible, the custom of keeping a fatted calf evidently prevailed, as is shown by the conduct of Abraham, who, when he was visited by the three heavenly guests, "ran unto the herd, and fetched a calf, tender and good," and had it killed and dressed at once, after the still existing fashion of the East. [Illustration: ABRAHAM OFFERS FOOD TO THE THREE STRANGERS.] But, even in the times of Israel's greatest prosperity, the chief use of the ox was as an agricultural labourer, thus reversing the custom of this country, where the horse has taken the place of the ox as a beast of draught, and where cattle are principally fed for food. Ploughing was, and is, always performed by oxen, and allusions to this office are scattered plentifully through the Old and New Testaments. When understood in this sense, oxen are almost always spoken of in connexion with the word "yoke," and as each yoke comprised two oxen, it is evident that the word is used as we employ the term "brace," or pair. The yoke, which is the chief part of the harness, is a very simple affair. A tolerably stout beam of wood is cut of a sufficient length to rest upon the necks of the oxen standing side by side, and a couple of hollows are scooped out to receive the crest of the neck. In order to hold it in its place, two flexible sticks are bent under their necks, and the ends fixed into the beam of the yoke. In the middle of this yoke is fastened the pole of the plough or cart, and this is all the harness that is used, not even traces being required. It will be seen that so rude an implement as this would be very likely to gall the necks of the animals, unless the hollows were carefully smoothed, and the heavy beam adapted to the necks of the animals. This galling nature of the yoke, so familiar to the Israelites, is used repeatedly as a metaphor in many passages of the Old and New Testaments. These passages are too numerous to be quoted, but I will give one or two of the most conspicuous among them. The earliest mention of the yoke in the Scriptures is a metaphor.