Reference for Makkot 9:9

דבי ר' ישמעאל תנא (דברים יט, טז) לענות בו סרה עד שתסרה גופה של עדות

In the school of Rebbi Yishmeal it was taught, (Deuteronomy 19, 16) "to bear perverted testimony against him" [we derive from this verse that witnesses do nitty before zomemim] until the bodies of the testimony[the witnesses] become prevented.

Jastrow

Jastrow