Reference for Yevamot 216:13

אמר רבי ישמעאל בר' יוסי לזו לא הוצרכנו לאיסור כרת התרת לאיסור לאו לא כל שכן

Rab Judah replied in the name of Rab: To this may be applied the Scriptural text,<span class="x" onmousemove="('comment',' Lit., 'what (is the meaning) of that which was written'. ');">²⁸</span> We have drunk our water for money; our wood cometh to us for price.<span class="x" onmousemove="('comment',' Lam. v, 4. ');">²⁹</span> In the time of proscription<span class="x" onmousemove="('comment',' Lit., 'danger': the times of the suppression of the Bar Kokeba revolt in 135 C.E. when the study of the Torah and Rabbinic or oral law was forbidden by the Roman authorities under pain of death, ');">³⁰</span>

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