From the Death of Saul to the Death of David - Flavius Josephus

Amnon; but because he had an extraordinary affection for him, for he was
his eldest son, he was compelled not to afflict him; but Absalom watched for
a fit opportunity of revenging this crime upon him, for he thoroughly hated
him. Now the second year after this wicked affair about his sister was over,
and Absalom was about to go to shear his own sheep at Baalhazor, which is a
city in the portion of Ephraim, he besought his father, as well as his brethren,
to come and feast with him: but when David excused himself, as not being
willing to be burdensome to him, Absalom desired he would however send
his brethren; whom he did send accordingly. Then Absalom charged his own
servants, that when they should see Amnon disordered and drowsy with
wine, and he should give them a signal, they should fear nobody, but kill
him.
3. When they had done as they were commanded, the rest of his brethren
were astonished and disturbed, and were afraid for themselves, so they
immediately got on horseback, and rode away to their father; but somebody
there was who prevented them, and told their father they were all slain by
Absalom; whereupon he was overcome with sorrow, as for so many of his
sons that were destroyed at once, and that by their brother also; and by this
consideration, that it was their brother that appeared to have slain them, he
aggravated his sorrow for them. So he neither inquired what was the cause of
this slaughter, nor staid to hear any thing else, which yet it was but
reasonable to have done, when so very great, and by that greatness so
incredible, a misfortune was related to him: he rent his clothes and threw
himself upon the ground, and there lay lamenting the loss of all his sons,
both those who, as he was informed, were slain, and of him who slew them.
But Jonadab, the son of his brother Shemeah, entreated him not to indulge
his sorrow so far, for as to the rest of his sons he did not believe that they
were slain, for he found no cause for such a suspicion; but he said it might
deserve inquiry as to Amnon, for it was not unlikely that Absalom might
venture to kill him on account of the injury he had offered to Tamar. In the
mean time, a great noise of horses, and a tumult of some people that were
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