1 Samuel 28:17-18 The Lord has done what he predicted through me. The Lord has torn the kingdom out of your hands and given it to one of your neighbors—to David. Because you did not obey the Lord or carry out his fierce wrath against the Amalekites, the Lord has done this to you today. 
When we do not obey the Lord, there are consequences. Sometimes, God will use others to fulfill His purpose in our place, causing us to lose an honored position previously granted by the Lord.