Rulers are mentioned in the Quran in these verses:
[22:41] They are those who, if we appointed them as rulers on earth, they would establish the Contact Prayers (Salat) and the obligatory charity (Zakat), and would advocate righteousness and forbid evil. God is the ultimate ruler.
[38:26] O David, we have made you a ruler on earth. Therefore, you shall judge among the people equitably, and do not follow your personal opinion, lest it diverts you from the way of God. Surely, those who stray off the way of God incur severe retribution for forgetting the Day of Reckoning.
[40:15] Possessor of the highest ranks, and Ruler of the whole dominion. He sends inspiration, bearing His commands, to whomever He chooses from among His servants, to warn about the Day of Summoning.
To learn more, read the Quran in English.
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