Mas'sah (Heb. Massah', מִסָּה, trial, as often; Sept. πειρασμός, πείρα; Vulg. tentatio), a name given to the spot in Rephidim where the Israelites provoked Jehovah by murmuring for want of water; otherwise called MERIBAH (Ex 17:7; De 6:16; De 9:22; De 28:8). The name also occurs (in the Heb.), with mention of the circumstances which occasioned it, in Ps 95:8-9, and its Greek equivalent in Heb 3:8.