Reference for Shevuot 71:27

אלא קשיא כי לית ליה בממונא אבל באיסורא אית ליה

[HE WHO CURSES] HIMSELF: as it is written: Only take heed to thyself, and keep thy soul diligently;<span class="x" onmousemove="('comment',' Deut. IV, 9. [The verse is explained in Ber. ');">³⁸</span> and as R'Abin said in the name of R'Elai; for he said; Wherever it is said, take heed, lest, or not, it is nothing bu negative precept.<span class="x" onmousemove="('comment',' Here, 'take heed to thyself' means 'do not curse thyself.'');">³⁹</span>

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