ISB ~ 1 Corinthians 4 v6

learn by us:An appeal to listen to the shepherds of the Church and live according to their example (4:16; 11:1).

not to go beyond what is written:Paul cautions believers to stay within the limits of personal humility defined by the Scriptures. He is referring specifically to the string of OT warnings about boasting quoted earlier in the letter (1:19, 31; 3:19-20). Paul’s purpose here is to halt the damaging effects of arrogance in Corinth, as indicated by the clarification that follows. Interpretations of this verse that suggest Paul is restricting the basis for Christian doctrine and morals to what is explicitly set forth in the books of the Bible (sola Scriptura) are misleading and untenable. Nothing in the context points to such a broad concern, and in any case Paul insists elsewhere that even the inspired preaching of the apostles is on a par with the written word of God (1 Thess 2:13; 2 Thess 2:15; 3:6).