Psalms 15 is read on special days of festive joy in place of Taḥanun. Rabbi Zalman Schachter-Shalomi, z”l, included his translation of Psalms 15 in his Siddur Tehillat Hashem Yidaber Pi (2009). To the best of my ability, I have set his translation side-by-side with the verses comprising the Psalm. –Aharon N. Varady . . .