וַיִּקְרָ֥א הַמֶּ֛לֶךְ לַגִּבְעֹנִ֖ים וַיֹּ֣אמֶר אֲלֵיהֶ֑ם וְהַגִּבְעֹנִ֞ים לֹ֣א מִבְּנֵ֧י יִשְׂרָאֵ֣ל הֵ֗מָּה כִּ֚י אִם־מִיֶּ֣תֶר הָאֱמֹרִ֔י וּבְנֵ֤י יִשְׂרָאֵל֙ נִשְׁבְּע֣וּ לָהֶ֔ם וַיְבַקֵּ֤שׁ שָׁאוּל֙ לְהַכֹּתָ֔ם בְּקַנֹּאת֥וֹ לִבְנֵֽי־יִשְׂרָאֵ֖ל וִיהוּדָֽה׃
И призвал царь Гаваонитян и сказал им—теперь гаваонитяне были не сынами Израилевыми, а остатками аморреев; и сыны Израилевы поклялись им; и Саул стремился убить их в своем рвении к детям Израиля и Иудеи—
Mishneh Torah, Repentance
It is forbidden for man to be ill-natured and unforgiving, for he must be easily appeased but unwidely to wrath; and when a sinner implores him for pardon, he should grant him pardon wholeheartedly and soulfully. Even if one persecuted him and sinned against him exceedingly he should not be vengeful and grudge-bearing, for such is the path of the seed of Israel and of their excellent heart. Only the idolaters are not so, they are of uncircumcised heart, and their wrath is ever-watchful; and, because the Gibonites were unforgiving and unappeasing, that of them it is said: "Now the Gibonites were not of the children of Israel" (II. Samuel, 21.2).11Baba Kamma, 92a. C.
Mishneh Torah, Human Dispositions
If one man commit a sin against another man, the one sinned against shall not remain in silent hate against the sinner, as it is said of the wicked: "And Absalom spoke unto Amnon neither good nor bad; for Absalom hated Amnon" (Second Samuel. 13.22); but, on the contrary, it is obligatory upon him to make known to him and say unto him: "Why have you done to me thus and such, and wherefore have you sinned against me in that particular matter?"; for, it is said: "And thou shalt indeed rebuke thy neighbor" (Lev. 19.17). And, if the sinner did repent and begged to be forgiven by him, he must forgive him; and in doing so he should not be cruel, for it is said: "And Abraham prayed unto God" (Gen. 20.17).6For Abimelech, who sinned against him. G.
Sefer Chasidim
This is the path of the upright with their steadfast hearts, but the gentiles with their uncircumsized hearts are not so,1Yebamoth 79a. and their wrath is kept forever. Concerning the Gibeonites, because they have not forgiven and have remained unpacified, Scripture says, they “Were not of the children of Israel” (II Sam. 21:2).2See II Samuel 21:1, in Soncino Books of the Bible, ed. A. Cohen (London: Soncino Press, 1949), 319. He who has sinned against his teacher and seeks his pardon but is not pardoned, returns even a hundred times until he is pardoned.3Yoma 87b.