In The Name of Allaah, The Most Merciful, The Bestower of Mercy.

Allaah [The Exalted] said:

وَقِيلَ لِلَّذِينَ ٱتَّقَوۡاْ مَاذَآ أَنزَلَ رَبُّكُمۡ‌ۚ قَالُواْ خَيۡرً۬ا‌ۗ لِّلَّذِينَ أَحۡسَنُواْ فِى هَـٰذِهِ ٱلدُّنۡيَا حَسَنَةٌ۬‌ۚ وَلَدَارُ ٱلۡأَخِرَةِ خَيۡرٌ۬‌ۚ وَلَنِعۡمَ دَارُ ٱلۡمُتَّقِينَ

جَنَّـٰتُ عَدۡنٍ۬ يَدۡخُلُونَہَا تَجۡرِى مِن تَحۡتِہَا ٱلۡأَنۡهَـٰرُ‌ۖ لَهُمۡ فِيہَا مَا يَشَآءُونَ‌ۚ كَذَٲلِكَ يَجۡزِى ٱللَّهُ ٱلۡمُتَّقِينَ

ٱلَّذِينَ تَتَوَفَّٮٰهُمُ ٱلۡمَلَـٰٓٮِٕكَةُ طَيِّبِينَ‌ۙ يَقُولُونَ سَلَـٰمٌ عَلَيۡكُمُ ٱدۡخُلُواْ ٱلۡجَنَّةَ بِمَا كُنتُمۡ تَعۡمَلُونَ

And (when) it is said to those who are pious, “What is it that your Lord has sent down?” They say: “That which is good.” For those who do good in this world, there is good, and the home of the Hereafter will be better. And excellent indeed will be the home (i.e. Paradise) of the pious. Adn (Eden) Paradise (Gardens of Eternity) which they will enter, under which rivers flow, they will have therein all that they wish. Thus Allah rewards the pious. Those whose lives the angels take while they are in a pious state, saying (to them): Salamun ‘Alaikum (peace be on you) enter you Paradise, because of (the good) which you used to do (in the world).” [Surah An-Nahl. Aayaat 30-32]

[وَقِيلَ لِلَّذِينَ ٱتَّقَوۡاْ مَاذَآ أَنزَلَ رَبُّكُمۡ‌ۚ قَالُواْ خَيۡرً۬ا‌ۗ  – And (when) it is said to those who are pious, “What is it that your Lord has sent down?” They say: “That which is good.”]

Abu Saaleh [rahimahullaah] narrated from Ibn Abbaas [radiyallaahu anhumaa] who said that the Quraish polytheists sent sixteen men to the main mountain roads during the days of hajj and dispersed four men on each road to hinder people from believing in Allaah’s Messenger [sallal laahu alayhi wasallam], saying, “Whoever comes to you asking about Muhammad, then some of you should say, he is a poet, and some of you should say, he is a Soothsayer, and some of you should say, he is a mad man, so it is better that neither you see him nor he sees you. And when the people come to us, we will agree with what you said to them on the roads”.

So, when this reached Allaah’s Messenger [sallal laahu alayhi wasallam], he also sent four believers on each main road – and amongst them were Abdullaah Ibn Mas’ood [radiyallaahu anhu] – and commanded them to belie what the Quraish were saying, so when the people would go past the polytheists, they said what they said about the Messenger, but the Muslims would say, “You have lied, rather he calls to the truth, commands good and forbids evil”. So they said, “What is the good he calls to?” They said, [لِّلَّذِينَ أَحۡسَنُواْ فِى هَـٰذِهِ ٱلدُّنۡيَا حَسَنَةٌ۬‌ۚ وَلَدَارُ ٱلۡأَخِرَةِ خَيۡرٌ۬‌ۚ وَلَنِعۡمَ دَارُ ٱلۡمُتَّقِينَ   – For those who do good in this world]- Meaning, the good of Laa Ilaaha Ilal laah- the best of deeds in reward and that which they are blessed with of its good and obedience to Allaah; [وَلَدَارُ ٱلۡأَخِرَةِ خَيۡرٌ۬‌ۚ – and the home of the Hereafter will be better]- meaning, nobility in the sight of Allaah in the Hereafter and in paradise. [Ref 1]

[ٱلَّذِينَ تَتَوَفَّٮٰهُمُ ٱلۡمَلَـٰٓٮِٕكَةُ طَيِّبِينَ‌ۙ يَقُولُونَ سَلَـٰمٌ عَلَيۡكُمُ ٱدۡخُلُواْ ٱلۡجَنَّةَ بِمَا كُنتُمۡ تَعۡمَلُونَ  – Those whose lives the angels take while they are in a pious state, saying (to them): Salamun ‘Alaikum (peace be on you) enter you Paradise, because of (the good) which you used to do (in the world)]- Meaning, those who abided to piety will  receive a perfect greeting, safe from every evil and that which they hate. [ٱدۡخُلُواْ ٱلۡجَنَّةَ بِمَا كُنتُمۡ تَعۡمَلُونَ- enter you Paradise, because of (the good) which you used to do (in the world)]- meaning, because of your belief in Allaah and submission to His command. [Ref 2]

Ref 1: Excerpt from Zaadul Maseer Fee Ilmit Tafseer’ by Imaam Ibnul Jawzi [rahimahullaah]. slightly paraphrased

Ref 2: An Excerpt from Tafseer As-Sadi. slightly paraphrased