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1 Corinthians 4:6 "Do not go beyond what is written." Then you will not take pride in one man over against another.

Here is the context of the verse.

4 This, then, is how you ought to regard us: as servants of Christ and as those entrusted with the mysteries God has revealed. 2 Now it is required that those who have been given a trust must prove faithful. 3 I care very little if I am judged by you or by any human court; indeed, I do not even judge myself. 4 My conscience is clear, but that does not make me innocent. It is the Lord who judges me. 5 Therefore judge nothing before the appointed time; wait until the Lord comes. He will bring to light what is hidden in darkness and will expose the motives of the heart. At that time each will receive their praise from God. 6 Now, brothers and sisters, I have applied these things to myself and Apollos for your benefit, so that you may learn from us the meaning of the saying, “Do not go beyond what is written.” Then you will not be puffed up in being a follower of one of us over against the other. 7 For who makes you different from anyone else? What do you have that you did not receive? And if you did receive it, why do you boast as though you did not? 8 Already you have all you want! Already you have become rich! You have begun to reign—and that without us! How I wish that you really had begun to reign so that we also might reign with you! 9 For it seems to me that God has put us apostles on display at the end of the procession, like those condemned to die in the arena. We have been made a spectacle to the whole universe, to angels as well as to human beings. 10 We are fools for Christ, but you are so wise in Christ! We are weak, but you are strong! You are honored, we are dishonored! 11 To this very hour we go hungry and thirsty, we are in rags, we are brutally treated, we are homeless. 12 We work hard with our own hands. When we are cursed, we bless; when we are persecuted, we endure it; 13 when we are slandered, we answer kindly. We have become the scum of the earth, the garbage of the world—right up to this moment.

I do not see how you derive (or support) the principle of Sola Scriptura from a passage that talks about judging people.