A son that was lame. — The reason for the introduction here of this account of Mephibosheth, Jonathan’s son, is to show that, he being physically in capacitated for the throne, the house of Saul became practically extinct with the death of Ish-bosheth. There were other descendants, but either illegitimate or of the female line (2 Samuel 21:8-9), and hence there was none other of his house to claim the throne.
Related Commentaries of 2 Samuel 4:4
2 Samuel 4:4
4 And Jonathan, Saul's son, had a son that was lame of his feet. He was five years old when the tidings came of Saul and Jonathan out of Jezreel, and his nurse took him up, and fled: and it came to pass, as she made haste to flee, that he fell, and became lame. And his name was Mephibosheth.b