Keilim

Keilim or Kelim (Hebrew: כֵּלִים, literally "Vessels") is the first tractate in the Order of Tohorot in the Mishnah. It contains thirty chapters, making it the longest tractate in the entire Mishnah. The Tosefta on Keilim consists of twenty-five chapters, divided into Bava Kama ("First Gate"), Bava Metzia ("Middle Gate"), and Bava Batra ("Final Gate") of Keilim. The tractate discusses the laws of ritual purity and impurity pertaining to all types of vessels.

There is no Gemara for Keilim in either the Babylonian or Jerusalem Talmud.

ArtScroll Mishnah Series has recently published a landmark 2 volume series explaining all of Mishnayot Keilim in English with many full color illustrations.

Ohr

Ohr ("Light" Hebrew: אור‎; plural: Ohros/Ohrot "Lights" Hebrew: אורות‎) is a central Kabbalistic term in the Jewish mystical tradition. The analogy of physical light is used as a way of describing metaphysical Divine emanations. Shefa ("Flow" Hebrew: שפע‎ and its derivative, Hashpoah "Influence" Hebrew: השפעה‎) is sometimes alternatively used in Kabbalah, a term also used in Medieval Jewish Philosophy to mean Divine influence, while the Kabbalists favour Ohr because its numerical value equals Raz ("mystery"). It is one of the two main metaphors in Kabbalah for understanding Divinity, along with the other metaphor of the human soul-body relationship for the Sephirot. The metaphorical description of spiritual Divine creative-flow, using the term for physical "light" perceived with the eye, arises from analogous similarities. These include the intangible physicality of light, the delight it inspires and the illumination it gives, its apparently immediate transmission and constant connection with its source. Light can be veiled ("Tzimtzum"-constrictions in Kabbalah) and reflected ("an ascending light from the Creations" in Kabbalah). White light divides into 7 colours, yet this plurality unites from one source. Divine light divides into the 7 emotional Sephirot, but there is no plurality in the Divine essence. The term Ohr in Kabbalah is contrasted with Ma'ohr, the "luminary", and Kli, the spiritual "vessel" for the light.