New Defender's Study Bible Notes
9:1 for Jonathan’s sake. David knew that all of Saul’s sons were dead, but he remembered his promises to Jonathan and to Saul (I Samuel 20:15,42; 24:21).
9:3 lame on his feet. The account of the accident which crippled Mephibosheth is given in II Samuel 4:4.
9:7 Fear not. Mephibosheth had reason to fear: it was customary for victorious kings to slay all the sons of the previous king, to prevent one of them trying to regain the kingdom. But David —like God acting toward us—acted in grace toward Mephibosheth for Jonathan’s sake.
9:12 whose name was Micha. From this great-grandson of Saul’s the family of Saul continued on for many generations (I Chronicles 8:34-40).
9:13 Mephibosheth. Mephibosheth, in a sense, can be considered a type of the helpless sinner, saved by grace, and raised from his helpless condition to sup at the table of the King, all because the great King loved the Friend who died.