Deuteronomy 21:22

When a man hath become guilty of the judgment of death, and is condemned to be stoned, and they afterwards hang him on a beam,

From our Sages, of blessed memory, we have received the laws explaining which criminals are hanged [Sanhedrin 45b].

AND THOU SHALT HANG HIM. “Our Rabbis have said: All that have been stoned must be hanged. It is this which is stated, for he that is hanged is a reproach unto G-d, and is a degradation of the King, for man is made in the image of the King, and the Israelites are His children. There is a parable of two brothers who resembled each other etc.” This is Rashi’s language. “All that have been stoned must be hanged” are the words of an individual Sage [i.e., Rabbi Eliezer], but the law is according to the words of the Sages that no offender [executed by] stoning is hanged save the blasphemer and the idolator. This is the sense of the phrase, for he that is hanged is a reproach unto G-d, — because people will say, “Why was this person hanged? Because he blasphemed G-d or worshipped a particular idol by means of this particular service, and he saw therein this sign or wonder.” The discussion of the idol and the service thereof are considered a k’lalah [“a reproach” to G-d]. Or it is an expression of “degradation” as the Rabbi [Rashi] mentioned, from the expressions and he cursed me with a grievous ‘k’lalah (curse); that his sons did bring ‘a curse’ upon themselves [both verses being expressions of] contempt. And the parable concerning the twin brothers contains a secret; it does not refer, as the Rabbi thought, to the Israelites who are called the children of G-d.
In line with the simple meaning of Scripture the verse is stating: “If a man has committed a great sin for which he is deserving of death and of hanging on a tree because of the grievous nature of his sin, nevertheless his body shall not remain all night upon the tree, for the most accursed and blasted of all people is the hanged. Among all forms of death, there is none as ugly and despicable like it [this degradation of the human body], and it is not fitting that we defile the Land and that G-d’s curse be within the Holy Land, for there the Eternal commanded the blessing, even life forever. Therefore Joshua commanded and they took them down off the trees.
In my opinion the affair of Saul’s children who were left hanging? The answer follows in the text. — It should also be pointed out that because of their display of cruelty the Gibeonites were forever banned from marrying into Israel (Yebamoth 79a). was because they were not hanged by a court of Israel, nor by any Israelite. Rather, David who turned them [the seven members of Saul’s …