BT BM 86b(26) :מביאין שור ממרעיתו כדלא אניס ותרנגולת מאשפה כדלא אניסא‏ : they bring an ox from his herd not having been compelled (to work), and a hen from a garbage heap not having been compelled (to work)
See the entire entry for kdlˀ conj. it not being the case that