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Romans 15:20
Robinson-Pierpont Byzantine Textform · Berean Standard Bible
οὕτως δὲ φιλοτιμούμενον εὐαγγελίζεσθαι, οὐχ ὅπου ὠνομάσθη χριστός, ἵνα μὴ ἐπ’ ἀλλότριον θεμέλιον οἰκοδομῶ·
In this way I have aspired to preach the gospel where Christ was not known, so that I would not be building on someone else’s foundation.