Rashi on the Former Prophets

Took Ish Boshes. He extrapolated from a verse that two kings were destined to come from Binyomin. Because the Holy One, blessed is He told Yakov, "Kings will come forth from you," and [by this time] all of his children had been born except for Binyomin.

The Plain of Swords. Yonasan translates the plain of Killing on account of the swords just like you say [in Scriptures] (Tehilim 89, 44) "You also turned back the sharpness of his sword."

Into the fifth rib. As [if to say] the fifth rib, the place where the bile and the liver are set. [But] Yonasan translated [this to mean] "on the side of his thigh,"
And died in his place. And died in his place.

If you had not spoken. If only you had spoken this [way earlier] [The לא] is as [if it were written] לו, meaning it. Another [way] to interpret it is as it's plain meaning: if you had not spoken i.e. that which you said "Let the young soldiers get up and playfight."

The Bisron. The name of a region.

Nineteen men and Asoel. But is not Asoel included in [the group called] "the servants of Dovid," so why is he [singled] out? [The reason is] he was worth all of them [together] and so too [a similar case], (Yehoshua 2,1), "Go see [and spy out] the land and Yericho" and so too [another similar case] "King Shlomo loved many foreign women and the daughter of Pharaoh." (Kings I, 11, 1 ).