I went about as though I grieved for my friend or my brother; as one who laments his mother, I bowed down in mourning.
PSALM 35. So long as Saul was the enemy of David, the nobles, and such as at that time bore any authority, had (according to the subservient spirit which always prevails in the courts of kings) eagerly conspired to destroy an innocent man.
Commenting on Psalm 35:1-28
"I behaved myself as though he had been my friend or brother:" I waited on him assiduously, comforted him affectionately, and sympathised with him deeply. This may refer to those days when David played on the harp, and chased away the evil spirit from Saul. "I bowed down heavily, as one that mourneth for his mother. He bowed his head as mourners do.
Two very wicked things David here lays to the charge of his enemies, to make good his appeal to God against them - perjury and ingratitude. I. Perjury, Psa 35:11. When Saul would have David attainted of treason, in order to his being outlawed, perhaps he did it with the formalities of a legal prosecution, produced witnesses who swore some treasonable words or overt acts...
Commenting on Psalm 35:11-16