Massah

trial, temptation, a name given to the place where the Israelites, by their murmuring for want of water, provoked Jehovah to anger against them. It is also called Meribah (Ex 17:7; Deut 6:16; Ps 95:8 ; 95:9; Heb 3:8 ).

EBD - Easton's Bible Dictionary