Talmud for Makkot 1:5
בָּאוּ אֲחֵרִים וְהִזִּימוּם, בָּאוּ אֲחֵרִים וְהִזִּימוּם, אֲפִלּוּ מֵאָה, כֻּלָּם יֵהָרֵגוּ. רַבִּי יְהוּדָה אוֹמֵר, אִסְטָסִית הִיא זוֹ, וְאֵינָהּ נֶהֱרֶגֶת אֶלָּא כַת הָרִאשׁוֹנָה בִלְבָד:
If others came and they (the refuters) rendered them zomemin; if others came, and they rendered them zomemin — even if they were a hundred [sets of witnesses, giving the same testimony one after the other, and all refuted by the same set], they are all killed. R. Yehudah says: "This (refuting) set is istasith" [perverse and devious, having taken counsel between themselves to refute whoever comes to give this testimony. Another interpretation: "Is this (refuting set a vat of) isatis" (a dye), (which dyes all who touch it)]! And only the first set of witnesses is killed. [R. Yehudah holds that after the first set is refuted, the succeeding set is not accepted; and if they do testify and are refuted, they are not killed, not satisfying: "Then you shall do to him, etc.", for he (the adjudged) is not killed by their testimony. The halachah is not in accordance with R. Yehudah.]