The word(s) "lesson" appears 168 time(s) in 166 verse(s) in Quran in Mohsin Khan translation.

(121) Allah said: "We will strengthen your arm through your brother, and give you both power, so they shall not be able to harm you: with Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.), you two as well as those who follow you will be the victors."

(122) Then when Musa (Moses) came to them with Our Clear Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.), they said: "This is nothing but invented magic. Never did we hear of this among our fathers of old."

(123) Then We saved him and those with him in the ship, and made it (the ship) an Ayah (a lesson, a warning) for the 'Alamin (mankind, jinn and all that exists).

(124) And those who disbelieve in the Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) of Allah and the Meeting with Him, it is they who have no hope of My Mercy: and it is they who will have a painful torment.

(125) And indeed We have left thereof an evident Ayah (a lesson and a warning and a sign - the place where the Dead Sea is now in Palestine) for a folk who understand.

(126) And (We destroyed also) Qarun (Korah), Fir'aun (Pharaoh), and Haman. And indeed Musa (Moses) came to them with clear Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.), but they were arrogant in the land, yet they could not outstrip Us (escape Our punishment).

(127) And thus We have sent down the Book (i.e. this Qur'an) to you (O Muhammad صلى الله عليه وسلم), and those whom We gave the Scripture [the Taurat (Torah) and the Injeel (Gospel) aforetime] believe therein as also do some of these (who are present with you now like 'Abdullah bin Salam) and none but the disbelievers reject Our Ayat [(proofs, signs, verses, lessons, etc.,) and deny Our Oneness of Lordship and Our Oneness of worship and Our Oneness of Our Names and Qualities: i.e. Islamic Monotheism].

(128) Nay, but they, the clear Ayat [i.e. the description and the qualities of Prophet Muhammad صلى الله عليه وسلم written in the Taurat (Torah) and the Injeel (Gospel)] are preserved in the breasts of those who have been given knowledge (among the people of the Scriptures). And none but the Zalimun (polytheists and wrongdoers) deny Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.).

(129) Then evil was the end of those who did evil, because they belied the Ayat (proofs, evidence, verses, lessons, signs, revelations, Messengers, etc.) of Allah and made a mockery of them.

(130) And as for those who disbelieved and belied Our Ayat (proofs, evidence, verses, lessons, signs, revelations, Allah's Messengers, Resurrection, etc.), and the Meeting of the Hereafter, such shall be brought forth to the torment (in the Hell-fire).