2 Samuel 4:4 ESV

4 Jonathan, the son of Saul, had a son who was crippled in his feet. He was five years old when the news about Saul and Jonathan came from Jezreel, and his nurse took him up and fled, and as she fled in her haste, he fell and became lame. And his name was Mephibosheth.

2 Samuel 9:3,6-7 ESV

3 And the king said, “Is there not still someone of the house of Saul, that I may show the kindness of God to him?”

6 And Mephibosheth the son of Jonathan, son of Saul, came to David and fell on his face and paid homage. And David said, “Mephibosheth!” And he answered, “Behold, I am your servant.”

7 And David said to him, “Do not fear, for I will show you kindness for the sake of your father Jonathan, and I will restore to you all the land of Saul your father, and you shall eat at my table always.”