John 10:1

(1) At the Feast of Tabernacles there was a practice, one of those which witnessed to a feeling wider than that of those who acted in it, of offering up seventy oxen for the seventy nations of the world, the number being taken partly from the list in Genesis, and partly from a vague idea of its sanctity. The number seventy was thus brought before the people with the recognition of the heathen world as within the hope of salvation, and the minds of men were prepared for the mission of the Seventy, which followed at no long interval.