"he shall be put to death": by the sword. You say, by the sword. But perhaps (it is to be) by strangulation! — You reason thus: It is written here "moth yumoth, and elsewhere, in respect to an adulterer, "moth yumoth." Just as there, by strangulation, so, here, by strangulation.
He Shall Be Put to Death by the Sword
Mekhilta Tractate Nezikin 4:7