Quran Chapter 2 Verse 246-248
Have you not considered the assembly of the Children of Israel after [the time of] Moses when they said to a prophet of theirs, “Send to us a king, and we will fight in the way of Allah “? He said, “Would you perhaps refrain from fighting if fighting was prescribed for you?” They said, “And why should we not fight in the cause of Allah when we have been driven out from our homes and from our children?” But when fighting was prescribed for them, they turned away, except for a few of them. And Allah is Knowing of the wrongdoers.
And their prophet said to them, “Indeed, Allah has sent to you Saul as a king.” They said, “How can he have kingship over us while we are more worthy of kingship than him and he has not been given any measure of wealth?” He said, “Indeed, Allah has chosen him over you and has increased him abundantly in knowledge and stature. And Allah gives His sovereignty to whom He wills. And Allah is all-Encompassing [in favor] and Knowing.”
And their prophet said to them, “Indeed, a sign of his kingship is that the chest will come to you in which is assurance from your Lord and a remnant of what the family of Moses and the family of Aaron had left, carried by the angels. Indeed in that is a sign for you, if you are believers.”