But he shall acknowledge the firstborn, the son of the hated, by giving him a double portion of all that is found with him; for he is the first of his strength, the right of the firstborn is his.
English: “His is the right of the firstborn” — the firstborn does not take a double portion in the mother’s property, for Scripture says “his is the right of the firstborn”: the right of the firstborn belongs to a man and not to a woman.
On the daf / in context: The double portion is limited to the father’s estate. Assets that belonged to the mother are divided equally.
Type of Learning
Mi’ut from “lo mishpat ha-bechorah.”
What Is Learned
The firstborn’s double portion applies only to the father’s property, never to the mother’s.