Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[193] Now Moses commanded them to make use of all the utensils which were more than were necessary to the structure of the tabernacle, for covering the tabernacle itself, the candlestick, and altar of incense, and the other vessels, that they might not be at all hurt when they journeyed, either by the rain, or by the rising of the dust. And when he had gathered the multitude together again, he ordained that they should offer half a shekel for every man, as an oblation to God; which shekel is a piece among the Hebrews, and is equal to four Athenian drachmae. ¹ Whereupon they readily obeyed what Moses had commanded; and the number of the offerers was six hundred and five thousand five hundred and fifty. Now this money that was brought by the men that were free, was given by such as were about twenty years old, but under fifty; and what was collected was spent in the uses of the tabernacle.