Parallel
Romans 15:20
Nestle 1904 Greek New Testament · 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.