C. F. Keil and Franz Delitzsch on Nehemiah 5:9

Neh 5:9

Nehemiah, moreover, continued (ויאמר, the Chethiv, is evidently a clerical error for ואמר, for the Niphal ויּאמר does not suit): “The thing ye do is not good: ought ye not (= ye surely ought) to walk in the fear of our God, because of the reproach of the heathen our enemies?” i.e., we ought not, by harsh and unloving conduct towards our brethren, to give our enemies occasion to calumniate us.