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

(41) Verily, those who belie Our Ayat (proofs, evidence, verses, lessons, signs, revelations) and treat them with arrogance, for them the gates of heaven will not be opened, and they will not enter Paradise until the camel goes through the eye of the needle (which is impossible). Thus do We recompense the Mujrimun (criminals, polytheists and sinners).

(42) "Who took their religion as an amusement and play, and the life of the world deceived them." So this Day We shall forget them as they forgot their meeting of this Day, and as they used to reject Our Ayat (proofs, evidence, verses, lessons, signs, revelations).

(43) The vegetation of a good land comes forth (easily) by the Permission of its Lord; and that which is bad, brings forth nothing but (a little) with difficulty. Thus do We explain variously the Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) for a people who give thanks.

(44) But they belied him, so We saved him and those along with him in the ship, and We drowned those who belied Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.). They were indeed a blind people.

(45) So We saved him and those who were with him by a mercy from Us, and We cut the roots of those who belied Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.); and they were not believers.

(46) "And you take vengeance on us only because we believed in the Ayat (proofs, evidence, lessons, signs, etc.) of our Lord when they reached us! Our Lord! pour out on us patience, and cause us to die as Muslims."

(47) They said [to Musa (Moses)]: "Whatever Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) you may bring to us, to work therewith your sorcery on us, we shall never believe in you."

(48) So We took retribution from them. We drowned them in the sea, because they belied Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) and were heedless about them.

(49) And We wrote for him on the Tablets the lesson to be drawn from all things and the explanation for all things (and said): Hold unto these with firmness, and enjoin your people to take the better therein. I shall show you the home of Al-Fasiqun (the rebellious, disobedient to Allah).

(50) I shall turn away from My Ayat (verses of the Qur'an) those who behave arrogantly on the earth, without a right, and (even) if they see all the Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.), they will not believe in them. And if they see the way of righteousness (monotheism, piety, and good deeds), they will not adopt it as the Way, but if they see the way of error (polytheism, crimes and evil deeds), they will adopt that way, that is because they have rejected Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) and were heedless (to learn a lesson) from them.