[If] one said, ‘‘I take upon myself [to bring] in an oven,’’ he may not bring something baked in a small stove, [nor] one baked on tiles, [nor] one baked in an Arabian cauldron. R’ Yehudah says: If he wishes, he may bring that which is baked in a small stove. [If he said,] ‘‘I take upon myself [to bring] a baked minchah-offering,’’ he may not bring half as challos and half as rekikin. R’ Shimon permits [this] because it is one offering.