A promise from David to the son of Jonathan called Mephibosheth. The book of 2 Samuel tells us that this young man was crippled from his two legs.
Something that we must keep in mind, is that the promises that God makes to us are good and remain forever, and in this case we will talk about David and Jonathan.
(Jonathan son of Saul had a son who was lame in both feet. He was five years old when the news about Saul and Jonathan came from Jezreel. His nurse picked him up and fled, but as she hurried to leave, he fell and became disabled. His name was Mephibosheth.)
2 Samuel 4:4