TgJ 1Sam17:39tos :משום דמגדפא הוא ודיניה בסקילה‏ : because he is a blasphemer and his sentence is stoning
See the entire entry for mšwm conj. because, since

TgJ 1Sam17:39tos :ודיניה בסקילה דהכי כתיב בספר אוריתא דמשה‏ : his judgment is stoning, for so it is written in the Torah of Moses
See the entire entry for sqylh n.f. stoning