1 Corinthians 9:2

εἰ ἄλλοις οὐκ εἰμὶ ἀπόστολος ἀλλά γε ὑμῖν εἰμι ἡ γὰρ σφραγὶς τῆς ἐμῆς ἀποστολῆς ὑμεῖς ἐστε ἐν Κυρίῳ