NUM292 R. Yehudah said in the name of Rav: Let one always occupy himself with Torah and with mitzvot, even not for the sake of Heaven, for "not for the sake of Heaven" will succeed to "for the sake of Heaven." For in reward for the forty-two sacrifices offered up by Balak, the king of Moav, he merited that Ruth issue forth from him, from home there descended Solomon, of whom it is written (I Kings 3:4): "a thousand burnt-offerings did he offer" (Sotah 47a)