出埃及记 17:3

³ 百姓在那里甚渴，要喝水，就向摩西发怨言，说：你为甚麽将我们从埃及领出来，使我们和我们的儿女并牲畜都渴死呢？

Uncover and grind meal

'To uncover' signifies adulterating the goods of the Word, and 'to grind meal' signifies falsifying its truths.