If a man has two wives, the one beloved and the one hated, and they bear him sons, the beloved and the hated, and the firstborn son is the hated one’s—
English: “Sons” — one might have thought that because daughters enter the inheritance in place of brothers the bechorah would also apply to them; therefore Scripture says “and they bear him sons”: sons are subject to the law of the firstborn, but daughters are not.
On the daf / in context: Although daughters inherit when there are no sons, the double portion remains restricted to males. The explicit word “banim” excludes daughters from the bechorah.
Type of Learning
Mi’ut from the word “banim.”
What Is Learned
The double portion of the firstborn applies only to sons, not to daughters.