Do not speak evil one of another, brethren. He that speaks evil of his brother, and judges his brother, speaks evil of the law, and judges the law: but if you judge the law, you are not a doer of the law, but a judge.

But brother goes to law with brother, and this before the unbelievers?

And when they heard it, they glorified the Lord, and said to him: You see, brother, how many myriads of the Jews there are that believe, and they are all zealous for the law.