Religious views on truth
There is no unilateral agreement among the different denominations of Judaism concerning truth. In Orthodox Judaism, truth is the revealed word of God, as found in the Hebrew Bible, and to a lesser extent, in the words of the sages of the Talmud. For Hasidic Jews truth is also found in the pronouncements of their rebbe, or spiritual leader, who is believed to possess divine inspiration. Kotzk, a Polish Hasidic sect, was known for their obsession with truth.
Heresy in Orthodox Judaism
The Greek term ἁίρεσις originally denoted "division," "sect," "religious" or "philosophical party," and is applied by Josephus to the three Jewish sects: Sadducees, Pharisees, and Essenes. The specific rabbinical term for heresies, or religious divisions due to an illegitimate spirit, is מינים ("minim") (lit. "kinds [of belief]"; the singular מין ("min") (literally, "a kind") for heretic or Gnostic is coined idiomatically, like "goy" and "`Am ha-aretz"). An alternative term, אפיקורוס (Apiqoros/Apikoros), which may have a different status, and is often used for apostates who turned towards agnosticism or atheism, is derived from Epicurus and the philosophy of Epicureanism.