Psalm 50:20
"Thou sittest and speakest against thy brother; thou slanderest thine own mother’s son."
Cross References (ranked by relevance)
And the brother shall deliver up the brother to death, and the father the child: and the children shall rise up against their parents, and cause them to be put to death.
He that hideth hatred with lying lips, and he that uttereth a slander, is a fool.
Thou shalt not go up and down as a talebearer among thy people: neither shalt thou stand against the blood of thy neighbour: I am the LORD.
Blessed are ye, when men shall revile you, and persecute you, and shall say all manner of evil against you falsely, for my sake.
Let the lying lips be put to silence; which speak grievous things proudly and contemptuously against the righteous.
And I heard a loud voice saying in heaven, Now is come salvation, and strength, and the kingdom of our God, and the power of his Christ: for the accuser of our brethren is cast down, which accused them before our God day and night.
The aged women likewise, that they be in behaviour as becometh holiness, not false accusers, not given to much wine, teachers of good things;
Even so must their wives be grave, not slanderers, sober, faithful in all things.
And many other things blasphemously spake they against him.