What does « To memorize / To preserve » mean in the Quran?

Allah will not impose blame upon you for what is meaningless in your oaths, but He will impose blame upon you for [breaking] what you intended of oaths. So its expiation is the feeding of ten needy people from the average of that which you feed your [own] families or clothing them or the freeing of a slave. But whoever cannot find [or afford it] - then a fast of three days [is required]. That is the expiation for oaths when you have sworn. But guard your oaths. Thus does Allah make clear to you His verses that you may be grateful.

And He is the subjugator over His servants, and He sends over you guardian-angels until, when death comes to one of you, Our messengers take him, and they do not fail [in their duties].

And this is a Book which We have sent down, blessed and confirming what was before it, that you may warn the Mother of Cities and those around it. Those who believe in the Hereafter believe in it, and they are maintaining their prayers.

There has come to you enlightenment from your Lord. So whoever will see does so for [the benefit of] his soul, and whoever is blind [does harm] against it. And [say], "I am not a guardian over you."

But if Allah had willed, they would not have associated. And We have not appointed you over them as a guardian, nor are you a manager over them.

[Such believers are] the repentant, the worshippers, the praisers [of Allah], the travelers [for His cause], those who bow and prostrate [in prayer], those who enjoin what is right and forbid what is wrong, and those who observe the limits [set by] Allah. And give good tidings to the believers.

But if they turn away, [say], "I have already conveyed that with which I was sent to you. My Lord will give succession to a people other than you, and you will not harm Him at all. Indeed my Lord is, over all things, Guardian."

What remains [lawful] from Allah is best for you, if you would be believers. But I am not a guardian over you."

Send him with us tomorrow that he may eat well and play. And indeed, we will be his guardians.

[Joseph] said, "Appoint me over the storehouses of the land. Indeed, I will be a knowing guardian."

So when they returned to their father, they said, "O our father, [further] measure has been denied to us, so send with us our brother [that] we will be given measure. And indeed, we will be his guardians."

He said, "Should I entrust you with him except [under coercion] as I entrusted you with his brother before? But Allah is the best guardian, and He is the most merciful of the merciful."

And when they opened their baggage, they found their merchandise returned to them. They said, "O our father, what [more] could we desire? This is our merchandise returned to us. And we will obtain supplies for our family and protect our brother and obtain an increase of a camel's load; that is an easy measurement."

Return to your father and say, "O our father, indeed your son has stolen, and we did not testify except to what we knew. And we were not witnesses of the unseen,

For each one are successive [angels] before and behind him who protect him by the decree of Allah. Indeed, Allah will not change the condition of a people until they change what is in themselves. And when Allah intends for a people ill, there is no repelling it. And there is not for them besides Him any patron.

Indeed, it is We who sent down the Qur'an and indeed, We will be its guardian.

And We have protected it from every devil expelled [from the mercy of Allah]

And We made the sky a protected ceiling, but they, from its signs, are turning away.

And of the devils were those who dived for him and did work other than that. And We were of them a guardian.

And they who guard their private parts

And they who carefully maintain their prayers -

Tell the believing men to reduce [some] of their vision and guard their private parts. That is purer for them. Indeed, Allah is Acquainted with what they do.

And tell the believing women to reduce [some] of their vision and guard their private parts and not expose their adornment except that which [necessarily] appears thereof and to wrap [a portion of] their headcovers over their chests and not expose their adornment except to their husbands, their fathers, their husbands' fathers, their sons, their husbands' sons, their brothers, their brothers' sons, their sisters' sons, their women, that which their right hands possess, or those male attendants having no physical desire, or children who are not yet aware of the private aspects of women. And let them not stamp their feet to make known what they conceal of their adornment. And turn to Allah in repentance, all of you, O believers, that you might succeed.

Indeed, the Muslim men and Muslim women, the believing men and believing women, the obedient men and obedient women, the truthful men and truthful women, the patient men and patient women, the humble men and humble women, the charitable men and charitable women, the fasting men and fasting women, the men who guard their private parts and the women who do so, and the men who remember Allah often and the women who do so - for them Allah has prepared forgiveness and a great reward.

And he had over them no authority except [it was decreed] that We might make evident who believes in the Hereafter from who is thereof in doubt. And your Lord, over all things, is Guardian.