Arcana Coelestia #4315
4315. In the internal historical sense 'therefore the children of Israel do not eat the sinew of that which was displaced, which is on the hollow of the thigh' means that those descendants ought to know this. This becomes clear from the consideration that this was something serving to remind them about what they were really like, and so was something by which they ought to know this.
Genesis 34:25-26
25
It happened on the third day, when they were sore, that two of Jacob's sons, Simeon and Levi, Dinah's brothers, each took his sword, came upon the unsuspecting city, and killed all the males.
26
They killed Hamor and Shechem, his son, with the edge of the sword, and took Dinah out of Shechem's house, and went away.
