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

(71) They denied him, but We delivered him, and those with him in the ship, and We made them generations replacing one after another, while We drowned those who belied Our Ayat (proofs, evidence, lessons, signs, revelations, etc.). Then see what was the end of those who were warned.

(72) Then after them We sent Musa (Moses) and Harun (Aaron) to Fir'aun (Pharaoh) and his chiefs with Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.). But they behaved arrogantly and were Mujrimun (disbelievers, sinners, polytheists, criminals) folk.

(73) So this day We shall deliver your (dead) body (out from the sea) that you may be a sign to those who come after you! And verily, many among mankind are heedless of Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.).

(74) And be not one of those who belie the Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) of Allah, for then you shall be one of the losers.

(75) Say: "Behold all that is in the heavens and the earth," but neither Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) nor warners benefit those who believe not.

(76) 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).

(77) And indeed We sent Musa (Moses) with Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) and a manifest authority.

(78) Indeed in that (there) is a sure lesson for those who fear the torment of the Hereafter. That is a Day whereon mankind will be gathered together, and that is a Day when all (the dwellers of the heavens and the earth) will be present.

(79) Verily, in Yusuf (Joseph) and his brethren, there were Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) for those who ask.

(80) Indeed in their stories, there is a lesson for men of understanding. It (the Qur'an) is not a forged statement but a confirmation of (Allah's existing Books) which were before it [i.e. the Taurat (Torah), the Injeel (Gospel) and other Scriptures of Allah] and a detailed explanation of everything and a guide and a Mercy for the people who believe.