Reference for Kiddushin 55:1

שלא ניתנה להתבע בעד אחד מגלגלין ממון שניתן להתבע בעד אחד אינו דין שמגלגלין

though it [the oath] cannot be demanded of her on the evidence of one witness [only];<span class="x" onmousemove="('comment',' At least two witnesses must testify to her closeting herself (v. Sotah 2a) .');">¹</span> then in the case of a monetary claim, where a demand [for an oath] can be made on the evidence of one witness,<span class="x" onmousemove="('comment',' If A claims money from B and produces one witness to support his claim, B must swear that it is false; Sheb. 40a.');">²</span>

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