Bittachon (בִּטָּחוֹן) is the abstract noun form of the root batach, expressing the state or quality of trust, confidence, and assured reliance. While bitchah (H985) tends toward the personal feeling of security, bittachon often describes confidence in a source — whether misplaced in human power or rightly placed in God. It appears only twice in the Hebrew Bible but carries enormous weight in later Jewish theology, where bittachon became central to discussions of faith and divine dependence.
Rabbinic and medieval Jewish theologians elevated bittachon to a primary virtue. Bachya ibn Paquda (11th century) devoted an entire section of Duties of the Heart to it, distinguishing bittachon (active trust in God's provision) from mere emunah (belief). In the Bible, Isaiah mocks the false bittachon of Assyrian soldiers who boast in their military might, contrasting it with the true confidence available only through YHWH.