Reference for Pesachim 86:12

א"ר אבהו אמר רבי יוחנן כל איסורין שבתורה אין היתר מצטרף לאיסור חוץ מאיסורי נזיר שהרי אמרה תורה (במדבר ו, ג) משרת

Then [according to] R'Eliezer, say that 'whosoever' is to include women; 'for whosoever' is to include the mixture [of leaven]?<span class="x" onmousemove="('comment',' Teaching that kareth is involved, and not merely a negative precept.');">¹³</span> And should you answer, R'Eliezer does not interpret 'for whosoever' [as an additional extension] surely it was taught: For ye shall not burn any leaven.

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