Genesis 34:25-29

Verse 25

On the third day, when they were sore - When the inflammation was at the height, and a fever ensued which rendered the person utterly helpless, and his state critical, Simeon and Levi, the half brothers of Dinah, took each man his sword, probably assisted by that portion of the servants which helped them to take care of the flock, came on the city boldly, בטח betach, securely - without being suspected, and being in no danger of meeting with resistance, and slew all the males. Great as the provocation was, and it certainly was very great, this was an act or unparalleled treachery and cruelty.
Verse 27

The sons of Jacob - The rest of Jacob's sons, the remaining brothers of Simeon and Levi, spoiled the city. Though the others could slay the defenceless males, it was not likely that they could have carried away all the booty, with the women, children, and cattle; it is therefore most natural to suppose that the rest of the sons of Jacob assisted at last in the business.
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