English: “On wood in the fire” — in fire, and not in boiling lime and not in boiling gypsum.
In the sugya: The verse’s insistence on “ba-esh” excludes any method of destruction that relies on chemical heat rather than actual flame.
Type of Learning
Miyut of non-fire burning agents — the bull must be burned by actual fire, not by chemical heat.
What Is Learned
The chatas bull is destroyed only by real fire. Boiling lime or boiling gypsum, though capable of consuming flesh, do not satisfy the Torah’s requirement of “ba-esh.” The miyut keeps the avodah within the domain of ordinary combustion.