قُلْ أَؤُنَبِّئُكُم بِخَيْرٍ مِّن ذَٰلِكُمْ ۚ لِلَّذِينَ اتَّقَوْا عِندَ رَبِّهِمْ جَنَّاتٌ تَجْرِي مِن تَحْتِهَا الْأَنْهَارُ خَالِدِينَ فِيهَا وَأَزْوَاجٌ مُّطَهَّرَةٌ وَرِضْوَانٌ مِّنَ اللَّهِ ۗ وَاللَّهُ بَصِيرٌ بِالْعِبَادِ
Say: “Shall I inform you of things far better than those? For Al-Muttaqun there are Gardens (Paradise) with their Lord, underneath which rivers flow. Therein (is their) eternal (home) and Azwajun Mutahharatun (purified mates or wives), And Allah will be pleased with them. And Allah is All-Seer of the (His) slaves”.
﴾قُلْ أَؤُنَبِّئُكُمْ بِخَيْرٍ مِّن ذَلِكُمْ﴿
(Say: “Shall I inform you of things far better than those”)
This Ayah means, “Say, O Muhammad, to the people,” Should I tell you about what is better than the delights and joys of this life that will soon perish”
﴾لِلَّذِينَ اتَّقَوْاْ عِندَ رَبِّهِمْ جَنَّـتٌ تَجْرِى مِن تَحْتِهَا الاٌّنْهَارُ﴿
(For those who have Taqwa there are Gardens (Paradise) with their Lord, underneath which rivers flow)
meaning, rivers run throughout it. These rivers carry various types of drinks: honey, milk, wine and water such that no eye has ever seen, no ear has ever heard, and no heart has ever imagined
(Therein (is their) eternal (home))
meaning, they shall remain in it forever and ever and will not want to be removed from it.
(And Azwajun Mutahharatun (purified mates or wives))
meaning, from filth, dirt, harm, menstruation, post birth bleeding, and other things that affect women in this world.
﴾وَرِضْوَنٌ مِّنَ اللَّهِ﴿
(And Allah will be pleased with them)
meaning, Allah’s pleasure will descend on them and He shall never be angry with them after that. This is why Allah said in in Surah Bara`ah,
﴾وَرِضْوَنٌ مِّنَ اللَّهِ أَكْبَرُ﴿
(But the pleasure of Allah is greater) [9:72], meaning, greater than the eternal delight that He has granted them.
﴾وَاللَّهُ بَصِيرٌ بِالْعِبَادِ﴿
(And Allah is All-Seer of the (His) servants)
and, He gives each provisions according to what they deserve.
Taken from Tafseer Ibn Katheer (3:15)