The word(s) "leader" appears 23 time(s) in 21 verse(s) in Quran in Mohsin Khan translation.

(1) And (remember) when the Lord of Ibrahim (Abraham) [i.e., Allah] tried him with (certain) Commands, which he fulfilled. He (Allah) said (to him), "Verily, I am going to make you an Imam (a leader) for mankind (to follow you)." [Ibrahim (Abraham)] said, "And of my offspring (to make leaders)." (Allah) said, "My Covenant (Prophethood) includes not Zalimun (polytheists and wrong-doers)."

(2) Allah is the Wali (Protector or Guardian) of those who believe. He brings them out from darkness into light. But as for those who disbelieve, their Auliya (supporters and helpers) are Taghut [false deities and false leaders], they bring them out from light into darkness. Those are the dwellers of the Fire, and they will abide therein forever. (See V.2:81,82)

(3) Surely, We have sent down to you (O Muhammad صلى الله عليه وسلم) the Book (this Qur'an) in truth that you might judge between men by that which Allah has shown you (i.e. has taught you through Divine Revelation), so be not a pleader for the treacherous.

(4) Indeed Allah took the covenant from the Children of Israel (Jews), and We appointed twelve leaders among them. And Allah said: "I am with you if you perform As-Salat (Iqamat-as-Salat ) and give Zakat and believe in My Messengers; honour and assist them, and lend a good loan to Allah, verily, I will expiate your sins and admit you to Gardens under which rivers flow (in Paradise). But if any of you after this, disbelieved, he has indeed gone astray from the Straight Path."

(5) The leaders of his people said: "Verily, we see you in plain error."

(6) The leaders of those who disbelieved among his people said: "Verily, we see you in foolishness, and verily, we think you are one of the liars."

(7) The leaders of those who were arrogant among his people said to those who were counted weak - to such of them as believed: "Know you that Salih is one sent from his Lord." They said: "We indeed believe in that with which he has been sent."

(8) But if they violate their oaths after their covenant, and attack your religion with disapproval and criticism, then fight (you) the leaders of disbelief (chiefs of Quraish pagans of Makkah) - for surely their oaths are nothing to them - so that they may stop (evil actions).

(9) Such were 'Ad (people). They rejected the Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) of their Lord and disobeyed His Messengers, and followed the command of every proud obstinate (oppressor of the truth, from their leaders).

(10) Verily, Ibrahim (Abraham) was an Ummah (a leader having all the good righteous qualities), or a nation, obedient to Allah, Hanif (i.e. to worship none but Allah), and he was not one of those who were Al-Mushrikun (polytheists, idolaters, disbelievers in the Oneness of Allah, and those who joined partners with Allah).