TgJ Ez6:10 :לָא לְמַגָן גְזַרִית בְמֵימְרִי לְמַעֲבַד לְהוֹן בִשתָא הָדָא‏ : I have not decreed by my memra to do them this evil for no reason
See the entire entry for lmaggān,lmaggānā adv. in vain