C. F. Keil and Franz Delitzsch on Psalms 35:27-28

Psa 35:27-28

Those who wish that David’s righteousness may be made manifest and be avenged are said to take delight in it. When this takes place, Jahve’s righteousness is proved. יגדּל, let Him be acknowledged and praised as great, i.e., let Him be magnified! David desires that all who remain true to him may thus speak; and he, on his part, is determined to stir up the revelation of God’s righteousness in his heart, and to speak of that of which his heart is full (Psa 71:24).