Шмуэль Б 21:1 Галаха: Mishneh Torah, Fasts, Sefer Chasidim & Shulchan Arukh, Yoreh De'ah

וַיְהִ֣י רָעָב֩ בִּימֵ֨י דָוִ֜ד שָׁלֹ֣שׁ שָׁנִ֗ים שָׁנָה֙ אַחֲרֵ֣י שָׁנָ֔ה וַיְבַקֵּ֥שׁ דָּוִ֖ד אֶת־פְּנֵ֣י יְהוָ֑ה (ס) וַיֹּ֣אמֶר יְהוָ֗ה אֶל־שָׁאוּל֙ וְאֶל־בֵּ֣ית הַדָּמִ֔ים עַל־אֲשֶׁר־הֵמִ֖ית אֶת־הַגִּבְעֹנִֽים׃

И был голод во дни Давида три года, год за годом; и Давид искал лица Господня. И сказал Господь:'Это для Саула и для его кровавого дома, потому что он казнил Гаваонитян.'

Mishneh Torah, Fasts

In the sixth, he concludes, "He who answered David and his son, Solomon, in Jerusalem, He will answer you and hear the sound of your cry on this day. Blessed are You, Lord, who has mercy upon the Land." And all of the people answer, "Amen," after each and every blessing — in the way that they answer after all blessings.

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.

Shulchan Arukh, Yoreh De'ah

A minor who commits suicide wilfullly, is considered as though it were [done] unintentionally.12Sem(H). II, 4-5. Since he is of immature mind. The same is applicable to an imbecile — Tur. And likewise, one who was of age, and committed suicide wilfully, [being under pressure, as [in the case of] King Saul,13For whom suicide was permitted lest the Philistines torture him. Yeb. 78b: ‘“For Saul” (II Sam. XXI, 1) because he was not mourned for properly.’ also Gen. R. Noah XXXIV, 1 Thus also N and Asheri. On King Saul’s tragic death v. I Sam. — [the law is that] they withhold not from him a thing.