Donkeys for Grinding Grain
The donkey sometimes used for grinding grain. Here again, the usual method of grinding the grain is for the women to use smaller stones for their mills. The larger mill is elevated so that a singletree becomes suitable for the work. A camel may be used in place of a donkey. It was this type of a mill that the Philistines required Samson to pull (Judges 16:21).
JESUS referred to this larger type of millstone when he said: "But whoso shall offend [cause one of these little ones that believe on me to stumble], . . . it were better for him that a millstone [turned by an ass] were hanged about his neck, and that he were drowned in the depth of the sea" (Matthew 18:6). The size and weight of this stone made its illustrative use by JESUS very forceful. [Manners And Customs of Bible Lands]
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