Here the Mishnah is going to talk about a voluntary minchah (meal offering), which is the oven-baked minchah. We’ll talk about what type of oven it has to be prepared in. If somebody says, “I accept upon myself, I pledge to bring a minchah baked in an oven,” he has to bring a minchah that’s baked in a tanur. A tanur is a large oven. He can’t bring a minchah baked in a kupach. You can’t bring a minchah baked in a hole in the ground like the Arabs would make. They would dig a hole in the ground, put fire inside it, and cover it on top with clay. The heat inside would cook everything.
So, bottom line, according to Tanna Kama (first tanna), when you say that you’re going to bring a ma'afeh tanur, you’re going to bring an oven-baked minchah. It has to be baked specifically in an oven, which is a tanur. Any other type of oven is not suitable. Rabbi Yehuda disagrees. He says that if somebody wanted to, they’re allowed to bring a minchah baked in a kupach, because a kupach is a type of tanur.
There are two ways to bring the oven-baked minchah. You can either bring it as ten loaves or as ten wafers. What about a combination of both? Somebody says, “I accept upon myself to bring a baked minchah,” but they don’t say if they’re bringing loaves or wafers. You’re not allowed to bring half of the minchah as loaves and half as wafers. You have to bring all loaves or all wafers. That’s the bottom line. The loaves and the wafers are confused. They’re considered to be two different types of menachot (meal offerings). And if you made a pledge to bring the menachot over here that was ma'afeh, that was baked in an oven, you have to bring them all from the same category, or you’re bringing half of two separate menachot. Rabbi Shimon matir, but Rabbi Shimon allows you to mix and match. He allows you to bring part of the minchah as loaves and part as wafers, because it’s all considered to be an umbrella of the same korban (offering).
According to Rabbi Shimon, loaves and wafers are considered to be two different types of menachot. Loaves and wafers are not separate menachot, but are subcategories of the same korban, which is the oven-baked minchah. So therefore, you could bring half and half, and it’s considered to be an obligation to bring one minchah.