Parallel
Romans 15:20
Patriarchal Greek New Testament (1904) · Berean Standard Bible
οὕτω 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.