Reference for Bava Kamma 210:11

אתה מכרתו לי מאי מודה בעיקר איכא לא צריכא דא"ל לא נתתי לך דמי שקיל תורך וזיל

said: The defendant was alleging, and confirming it by an oath: 'I found it as a lost article and was not aware that it was yours to return it to you.' It was taught: Ben 'Azzai said: [The following] three [false] oaths [taken by a single witness<span class="x" onmousemove="('comment',' So interpreted by Rashi, but v. Malbim on Lev. V, 22, n. 374. ');">¹⁵</span>

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