Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[239] And then it was that the king's son rose hastily from supper; and being unable to admit any thing into his mouth for grief, he wept all night, both because he had himself been near destruction, and because the death of David was determined: but as soon as it was day, he went out into the plain that was before the city, as going to perform his exercises, but in reality to inform his friend what disposition his father was in towards him, as he had agreed with him to do; and when Jonathan had done what had been thus agreed, he dismissed his servant that followed him, to return to the city; but he himself went into the desert, and came into his presence, and communed with him. So David appeared and fell at Jonathan's feet, and bowed down to him, and called him the preserver of his soul; but he lifted him up from the earth, and they mutually embraced one another, and made a long greeting, and that not without tears. They also lamented their age, and that familiarity which envy would deprive them of, and that separation which must now be expected, which seemed to them no better than death itself. So recollecting themselves at length from their lamentation, and exhorting one another to be mindful of the oaths they had sworn to each other, they parted asunder.

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