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

(111) We have indeed sent down (in this Qur'an) manifest Ayat (proofs, evidence, verses, lessons, signs, revelations, lawful and unlawful things, and the set boundaries of Islamic religion, etc. that make things clear showing the Right Path of Allah). And Allah guides whom He wills to the Straight Path (i.e. to Allah's religion of Islamic Monotheism).

(112) And We said: "Go you both to the people who have denied Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.)." Then We destroyed them with utter destruction.

(113) And for each (of them) We put forward examples (as proofs and lessons), and each (of them) We brought to utter ruin (because of their disbelief and evil deeds).

(114) And those who, when they are reminded of the Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) of their Lord, fall not deaf and blind thereat.

(115) But when Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) came to them, clear to see, they said: "This is a manifest magic."

(116) These are their houses in utter ruin, for they did wrong. Verily, in this is indeed an Ayah (a lesson or a sign) for people who know.

(117) Nor can you lead the blind out of their error. You can only make to hear those who believe in Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.), and who have submitted (themselves to Allah in Islam as Muslims).

(118) And (remember) the Day when We shall gather out of every nation a troop of those who denied Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.), and (then) they (all) shall be driven (to the place of reckoning),

(119) Till, when they come (before their Lord at the place of reckoning), He will say: "Did you deny My Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) whereas you comprehended them not by knowledge (of their truth or falsehood), or what (else) was it that you used to do?"

(120) See they not that We have made the night for them to rest therein, and the day sight-giving? Verily, in this are Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) for the people who believe.