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

[181] Now the besieged had plenty of corn within the city, and indeed of all necessaries, but they wanted water, because there was no fountain in the city, the people being there usually satisfied with rain water; yet is it a rare thing in that country to have rain in summer, and at this season, during the siege, they were in great distress for some contrivance to satisfy their thirst; and they were very sad at this time particularly, as if they were already in want of water entirely, for Josephus seeing that the city abounded with other necessaries, and that the men were of good courage, and being desirous to protract the siege to the Romans longer than they expected, ordered their drink to be given them by measure; but this scanty distribution of water by measure was deemed by them as a thing more hard upon them than the want of it; and their not being able to drink as much as they would made them more desirous of drinking than they otherwise had been; nay, they were as much disheartened hereby as if they were come to the last degree of thirst. Nor were the Romans unacquainted with the state they were in, for when they stood over against them, beyond the wall, they could see them running together, and taking their water by measure, which made them throw their javelins thither the place being within their reach, and kill a great many of them.