Allah said in The Holy Qur'an:
In the name of Allah, Most Gracious, Most Merciful

Successful indeed are the believers. Those who offer their Salât (prayers) with all solemnity and full submissiveness. And those who turn away from Al-Laghw (dirty, false, evil vain talk, falsehood, and all that Allâh has forbidden). And those who pay the Zakât . And those who guard their chastity (i.e. private parts, from illegal sexual acts) Except from their wives or (the captives and slaves) that their right hands possess, for then, they are free from blame; But whoever seeks beyond that, then those are the transgressors; Those who are faithfully true to their Amanât (all the duties which Allâh has ordained, honesty, moral responsibility and trusts etc.) and to their covenants; These are indeed the inheritors. Who shall inherit the Firdaus (Paradise). They shall dwell therein forever. (Surât Al-Mu'minûn 23: 1-11).

Allah said in The Holy Qur'an:
In the name of Allah, Most Gracious, Most Merciful

3:102 O ye who believe! Fear Allah as He should be feared, and die not except in a state of Islam.
3:103 And hold fast, all together, by the rope which Allah (stretches out for you), and be not divided among yourselves; and remember with gratitude Allah's favour on you; for ye were enemies and He joined your hearts in love, so that by His Grace, ye became brethren; and ye were on the brink of the pit of Fire, and He saved you from it. Thus doth Allah make His Signs clear to you: That ye may be guided.
3:104 Let there arise out of you a band of people inviting to all that is good, enjoining what is right, and forbidding what is wrong: They are the ones to attain felicity.
3:105 Be not like those who are divided amongst themselves and fall into disputations after receiving Clear Signs: For them is a dreadful penalty,-
3:106 On the Day when some faces will be (lit up with) white, and some faces will be (in the gloom of) black: To those whose faces will be black, (will be said): "Did ye reject Faith after accepting it? Taste then the penalty for rejecting Faith."
3:107 But those whose faces will be (lit with) white,- they will be in (the light of) Allah's mercy: therein to dwell  (for ever).
3:108 These are the Signs of Allah: We rehearse them to thee in Truth: And Allah means no injustice to any of His creatures.
3:109 To Allah belongs all that is in the heavens and on earth: To Him do all questions go back (for decision).
3:110 Ye are the best of peoples, evolved for mankind, enjoining what is right, forbidding what is wrong, and believing in Allah. If only the People of the Book had faith, it were best for them: among them are some who have faith, but most of them are perverted transgressors.