Kehillah in Corinth I 14:8-10

Orthodox Jewish Bible

⁸ Indeed, if a shofar gives an unclear trumpet call, who will prepare himself for krav (battle)? [BAMIDBAR 10:9; YIRMEYAH 4:19]

⁹ So also unless you by your lashon (tongue) render an intelligible dvar Torah, how will the thing being uttered be known? For you will be merely speaking into the air.

¹⁰ There are doubtless many kinds of foreign languages in the Olam Hazeh, and not one is meaningless.