And as one of them opened his sack,.... According to the Targum of Jonathan and Jarchi, this was Levi; but Aben Ezra thinks it is more likely to be Reuben the firstborn, who was one, that is, the first of them:
to give his ass provender in the inn; at which they lay very probably the first night of their journey; a good man regards the life of his beast, and takes care of that as well as of himself, and generally in the first place:
he espied his money; the money which he paid for his corn:
for, behold, it [was] in his sack's mouth; just as he opened it.