οὐ λήψει τὸ ὄνομα Κυρίου τοῦ Θεοῦ σου ἐπὶ ματαίω → thou shalt not take the name of the Lord thy God in vain
third person singular present indicative active of a derivative of a compound of λύσις and τέλος; impersonally, it answers the purpose, i.e. is advantageous: it is better.