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.
Hasideans
Scholars have until recently started with the assumption that Hellenism "took root only in the upper classes of society, the main body of the [Jewish] nation being wholly untouched by it" and distinguished between the pious, law-abiding majority of the people and the Hasideans as a society of "extra-pious" Jews. However, the sources mentioned do not justify such a view. The συναγωγ σιδαίων of the books of the Maccabees, upon which so much emphasis is laid, corresponds, as has already long been known, to the קהל חסידים of the Psalms, which means neither "sect" nor "society", but only "congregation", with no idea of party. The piety attributed to Ḥasidim in the Talmudic sources is not in any way suggestive of a sect (Lehmann, in "R. E. J." xxx. 182 et seq.). The supposition that they were a sect closely associated with the scribes, and related to them, rests only on the fact that the two classes are mentioned together in I Macc. vii. 12, 13; the genuineness of verse 13, however, has been questioned by Hitzig ("Gesch. des Volkes Israel," p. 417).