Translation:Mishnah/Seder Nezikin/Tractate Avot/Chapter 1/11

English Translation
 Avtaloyon said: Sages, be careful with your words, unless you are exiled to a place of evil water [heretic teachings; see note]. The following students might drink and profane the name of the Heavens.  [Note: "Evil water" can be translated as "heretic teachings" because Torah is often referred to as mayim (water).]