1 Kings 11:12

“ Notwithstanding in your days I will not do it, for David your father's sake, but I will rend it out of the hand of your son.”

Nevertheless, for the sake of David to whom YHWH had given such wonderful promises about Solomon (2 Samuel 7:12; 2 Samuel 12:24), this would not take place while Solomon was alive, but after he had gone. For David had been promised that YHWH would not take away His mercy from his son as He had taken it away from Saul (2 Samuel 7:15), and YHWH would never go back on His promise. All His mercy therefore was for David's sake.