is not that of Jacob. Is it not possible [that] be signed on behalf of his father? — No one gives up his own name and uses as his signature the name of his father. Might he not have used it as a mere mark? For, surely, Rab drew a fish; R. Hanina drew a palm-branch; R. Hisda a Samek. R. Hoshaia, an Ayin, Rabbah son of R. Huna, a mast! — No one would be so impertinent [as] to make of the name of his father a [mere] symbol. Mar Zutra said: What is the need for all this! Any folded [deed the signature of] whose witnesses do not terminate with the same line [on the deed], is an invalid [document]. R. Isaac b. Joseph said in the name of R. Johanan: All erasures require confirmation; and the last line must contain a repetition of the subject matter of the deed. What is the reason?