Ex ha un significato molto variegato, su questo passo ecco cosa dice Strong ad esempio:
4. Its use to note the price is related, because the money is as it were, changed into that which is bought (the simple genitive of price is more common, cf. Winers Grammar, 206 (194); (Buttmann, § 132, 13)): ἀγοράζειν τί ἐκ τίνος, Matthew 27:7 (Baruch 6 (i. e., epistle of Jeremiah); Matthew 27:24); κτᾶσθαι ἐκ, Acts 1:18 (ὠνεῖσθαι ἐκ, Palaeph. 46, 3f); συμφώνειν ἐκ δηναρίου (because the agreement comes from the promised denary (cf. Winers Grammar, 368 (345); Buttmann, as above)), Matthew 20:2. Cognate to this is the phrase ποιεῖν ἑαυτῷ φίλους ἐκ τοῦ μαμωνᾷ Luke 16:9.
Shalom
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Sijmadicandhapajiee, gente per cui le arti stan nei musei - Paolo Conte
FORUM TESTIMONI DI GEOVA