From where is it [known] that one who says, ‘‘I take upon myself [to bring] a todah-offering,’’ must bring from that which is unconsecrated? Because it is stated (Deut. 16:2): And you shall sacrifice a pesach-offering to HASHEM your God, [from the] flocks and cattle. But does not the pesach-offering come only from sheep or goats? If so, why does it say flocks and cattle? It is in order to compare all that comes from cattle and flocks to the pesach-offering. Just as the pesach-offering, which comes as an obligation, comes only from that which is unconsecrated; so anything which comes as an obligation may be brought only from that which is unconsecrated. Therefore, if one says, ‘‘I take upon myself [to bring] a todah-offering’’; [or] ‘‘I take upon myself [to bring] a shelamimoffering,’’ since they come as an obligation, they may come only from that which is unconsecrated. However, libations in all cases come only from that which is unconsecrated.