Psalms 50:20

Thou sittest,.... Either in the chair of Moses, or on the seat of judgment, in the great sanhedrim of the nation; or, as Aben Ezra paraphrases it, "in the seat of the scornful";

[and] speakest against thy brother; even to pass sentence upon him, to put him to death for professing faith in Christ, Matthew 10:21;

thou slanderest thine own mother's son; the apostles and disciples of Christ, who were their brethren and kinsmen according to the flesh; and even our Lord Jesus Christ himself, who was bone of their bone, and flesh of their flesh.