Why is the ninth month called September?
Old English brynstan, from brin- stem of brinnen "to burn" (see burn (v.)) + stan (see stone (n.)). In Middle English the first element also recorded as brem-, brom-, brum-, bren-, brin-, bron-, brun-, bern-, born-, burn-, burned-, and burnt-. Formerly "the mineral sulfur," now restricted to biblical usage.
The Lord reynede vpon Sodom and Gomor brenstoon and fier. [Wycliff's rendition (1382) of Gen. xix:24]The Old Norse cognate compound brennusteinn meant "amber," as does German Bernstein.
an inflammable mineral substance found in quantities on the shores of the Dead Sea. The cities of the plain were destroyed by a rain of fire and brimstone (Gen. 19:24, 25). In Isa. 34:9 allusion is made to the destruction of these cities. This word figuratively denotes destruction or punishment (Job 18:15; Isa. 30:33; 34:9; Ps. 11:6; Ezek. 38:22). It is used to express the idea of excruciating torment in Rev. 14:10; 19:20; 20:10.