איוב טו:ג פירוש: רש״י

To debate over a matter from which he derives no benefit Heb. יסכון. To debate over a matter from which he will derive no benefit, like (I Kings 1:2), “and she shall be to him a warmer (סכנת),” and like (Ecc. 10:9), “is warmed (יסכן) by it,” i.e., he will derive benefit from it.