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Of the children of Israel's half, you shall take one drawn out of every fifty, of the persons, of the cattle, of the donkeys, and of the flocks, [even] of all the livestock, and give them to the Levites, who perform the duty of the tabernacle of Yahweh."
A 'thousand' means much, many, a countless number, a whole era of time, an abundance. When used in reference to the Lord, it actually means a number greater than that: In those cases it means what is infinite, what is truly without end.