R. Yonathan said to him: But we still have not heard! R. Yoshiyah: It is written (Ibid. 28:2) "Command the children of Israel and say to them: My offering, My bread … shall you observe to offer to Me in its appointed time, etc." (What is the purpose of this?) If to teach that the (offering of the) tamid overrides the Sabbath, is it not already written (Ibid. 9) "And on the Sabbath day, two lambs of the first year, etc." What, then, is the import of "in its appointed time"? It is "extra" for purposes of formulating a gezeirah shavah (an identity), viz.: It is written here "in its appointed time," and elsewhere, (Numbers 9:2) "in its appointed time." Just as the tamid overrides the Sabbath, so, here (the Pesach (Passover)) overrides the Sabbath.