Reference for Bava Kamma 215:1

ובאו עדים אקמייתא והודה אבתרייתא מאי

and it so happened that witnesses appeared and proved the first oath [to have been perjury]<span class="x" onmousemove="('comment',' And thus subject to Ex. XXII, 8. ');"><sup>1</sup></span>