(Exodus 12:20) "All leavening you shall not eat": What is the intent of this? (Ibid. 15) "Whoever eats chametz, that soul shall be cut off" tells me of the punishment. Whence do I derive the exhortation? From "All leavening you shall not eat." This tells me only of them (i.e., chametz and leavening). Whence do I derive (the same for) their admixtures? From "All."