Reference for Shevuot 71:8

מי כתיב וארור השתא דאתית להכי התם נמי לא כתיב וארור

It implies oath, as it is written: And Joshua adjured them at that time, saying, Arur be the man before the Lord. .<span class="x" onmousemove="('comment',' Josh. VI, 26; is used in the adjuration, hence it is a form of oath. rurt');">¹¹</span>

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