Jesus, the son of Mary was a messenger of God and a spirit proceeding from Him!

Verse 171 of Chapter 4

O People of the Book! Commit no excesses in your religion: Nor say of Allah aught but the truth. Christ Jesus the son of Mary was (no more than) a messenger of Allah, and His Word, which He bestowed on Mary, and a spirit proceeding from Him: so believe in Allah and His messengers. Say not "Trinity" : desist: it will be better for you: for Allah is one Allah: Glory be to Him: (far exalted is He) above having a son. To Him belong all things in the heavens and on earth. And enough is Allah as a Disposer of affairs.

Why did God forbid Jews some of the good things that were earlier lawful for them?

Verse 160 of Chapter 4

So due to the great injustices committed by the Jews, We forbade them some of the good things which were earlier lawful for them, and because they prevented many people from Allah's way. And because they used to take usury whereas they were forbidden from it, and they used to wrongfully devour people’s wealth; and for the disbelievers among them, We have kept prepared a painful punishment.

Depriving of or doing injustice to orphan girls and children is a grave sin!

Verse 127 of Chapter 4

They ask thy instruction concerning the women say: Allah doth instruct you about them: And (remember) what hath been rehearsed unto you in the Book, concerning the orphans of women to whom ye give not the portions prescribed, and yet whom ye desire to marry, as also concerning the children who are weak and oppressed: that ye stand firm for justice to orphans. There is not a good deed which ye do, but Allah is well-acquainted therewith.

Choosing Satan as a patron instead of Allah is the root cause of committing Shirk which God does not forgive!

Verses 116-121  of Chapter 4

Lo! Allah pardoneth not that partners should be ascribed unto Him. He pardoneth all save that to whom He will. Whoso ascribeth partners unto Allah hath wandered far astray. They invoke in His stead only females; they pray to none else than Satan, a rebel.Whom Allah cursed, and he said: Surely I will take of Thy bondmen an appointed portion. And surely I will lead them astray, and surely I will arouse desires in them, and surely I will command them and they will cut the cattle' ears, and surely I will command them and they will change Allah's creation. Whoso chooseth Satan for a patron instead of Allah is verily a loser and his loss is manifest.He promiseth them and stirreth up desires in them, and Satan promiseth them only to beguile.For such, their habitation will be hell, and they will find no refuge therefrom.

Does God not approve disclosure of evil words except by the oppressed ?

Verse 148 of Chapter 4

Allah loveth not the utterance of harsh speech save by one who hath been wronged. Allah is ever Hearer, Knower.

When is Secrecy permissible and rewarding?

Verse 114 of Chapter 4

In most of their secret talks there is no good: But if one exhorts to a deed of charity or justice or conciliation between men, (Secrecy is permissible): To him who does this, seeking the good pleasure of Allah, We shall soon give a reward of the highest (value).

Were there basically 3 different types of hypocrites? Making friendship was not allowed with only those hypocrites who were ready to attack on believers!

Verses 88-91 of Chapter 4

 How is it with you that there are two opinions among you concerning the hypocrites,116 whereas Allah has turned them back (to their former state) because of the evils they have earned? Do you desire to show guidance to him whom Allah has let go astray? You cannot find a path for him whom Allah has turned away from the right path. They really wish that you should also become disbelievers, as they themselves are so that both may become alike. So you should not take friends from among them unless they migrate in the way of Allah; and if they do not migrate, then seize them wherever you find them and slay them and do not take any of them as friends and helpers. However, those hypocrites are excepted who join a people who are allied to you by a treaty. Likewise, those hypocrites are excepted who come to you and are averse to fighting either against you of against their own people. Had Allah willed, He would have given them power over you and they also would have fought against you; therefore if they leave you alone and desist from fighting against you and make overtures for peace to you, in that case Allah has left you no cause for aggression against them. You will also find another kind of hypocrites, who wish to be at peace with you and also at peace with their own people but who would plunge into mischief, whenever they got an opportunity for it. If such people do not desist from your enmity nor make overtures for peace nor desist from fighting against you, then seize them and slay them wherever you find them, for We have given you a clear authority to fight against them.

Which is responsible for men's cruelty or desertion towards their wives?

Verse 128 of Chapter 4

If a wife fears cruelty or desertion on her husband's part, there is no blame on them if they arrange an amicable settlement between themselves; and such settlement is best; even though men's souls are swayed by greed. But if ye do good and practise self-restraint, Allah is well-acquainted with all that ye do.

There will be no protector on the day of Judgement for those who does evil deeds in this world!

Verses 123-124 of Chapter 4

The final result shall not be in accordance with your wishes nor in accordance with the wishes of the people of the Book. He who does evil shall be recompensed for it and he shall find no protector and no helper for himself against Allah. And the one who does good deeds, whether man or woman, provided that the one is a believer, will enter Paradise and they will not be wronged in the least of their rightful reward.

What is the consequence if anyone throws his or her own sin on to another innocent person?

Verse 112 of Chapter 4

But if any one earns a fault or a sin and throws it on to one that is innocent, He carries (on himself) (Both) a falsehood and a flagrant sin.

God should be remembered not only during prayers, but also at other times!

Verse 103 of Chapter 4

When ye have performed the act of worship, remember Allah, standing, sitting and reclining. And when ye are in safety, observe proper worship. Worship at fixed times hath been enjoined on the believers.

When can believers shorten their prayers?

Verse 101 of Chapter 4

When you go on a journey, there is no harm, if you shorten your Salat, (especially) when you fear that the disbelievers might harass you, for the disbelievers are openly bent upon enmity against you.

Does God forgive all major sins committed by people before completely submitting to Him?

Verses 53-54 of Chapter 39:

Say, "O My servants, who have wronged their own souls: Do not despair of Allah's mercy: surely Allah forgives all sins: He is the All-Forgiving, the All Merciful. Return to your Lord and submit to Him before the scourge overtakes you, and then you may get no help from anywhere. 

Did Allah create so many things in the earth unknown to us for our benefits as part of the ecosystem?

Verse 8 of Chapter 16:

And (He has created) horses, mules, and donkeys, for you to ride and use for show; and He has created (other) things of which ye have no knowledge.