David
Psalm 41:6ESV·traditional attribution

And when one comes to see me, he utters empty words, while his heart gathers iniquity; when he goes out, he tells it abroad.

John Calvin Reformed @genevareformer

PSALM 41 David, while he was severely afflicted by the hand of God, perceived that he was unjustly blamed by men who regarded him as one who had already been condemned and devoted to eternal destruction. Under this trial he fortifies himself by the consolation of hope. At the same time, he complains partly of the cruelty, and partly of the treachery, of his enemies.

Commenting on Psalm 41:1-13

C.H. Spurgeon Reformed Baptist @princeofpreachers

Here we have a controversy between the pleader and his God. He has been a tender friend to the poor, and yet in the hour of his need the promised assistance was not forthcoming. In our Lord's case there was a dark and dreary night in which such arguments were well befitting himself and his condition.

Commenting on Psalm 41:4

C.H. Spurgeon Reformed Baptist @princeofpreachers

And if he come to see me, he speaketh vanity. His visits of sympathy are visitations of mockery. When the fox calls on the sick lamb his words are soft, but he licks his lips in hope of the carcass. It is wretched work to have spies haunting one's bedchamber, calling in pretence of kindness, but with malice in their hearts.