Children of Israel's jealousy of Saul's kingship 2:247-251
2:247 Their Prophet said to them, 'Allah has raised Saul to be your king.' But they replied, 'Should he be given the kingship over us, when we are more deserving of it than he and he has not been given abundant wealth?' He said, 'Allah has chosen him over you and increased him with amplitude in knowledge and body. Allah gives His kingship to whom He will. Allah is the Embracer, the Knower.'
2:248 Their Prophet said to them, 'The sign of his kingship is the coming of the Ark to you, therein shall be tranquility from your Lord, and a remnant which the House of Moses and the House of Aaron left behind. It will be borne by the angels. That will be a sign for you if you are believers.'