[25].Surah Al-Furqan [The Criterion]: Ayat 16

১৬. তারা চিরকাল বসবাসরত অবস্থায় সেখানে যা চাইবে, তাই পাবে।  এই প্রার্থিত ওয়াদা পূরণ আপনার পালনকর্তার দায়িত্ব।

Ayat 16. For them (The Allah righteous Slave) there (in Jannah) will be therein all that they desire, and they will abide (there forever). It is a promise binding upon your Lord that must be fulfilled.

[Tafseer] of Ayat 16. "For them there will be therein all that they wish for:they will dwell (there) for aye: A promise to be prayed for from thy Lord." That is the sort of thing-the Goal of Allah's Presence-to be prayed for from Allah, and not ephemeral things, even though they may be good. And that is the sort of thing that Allah has promised and undertaken to give.

Hazrat Abu Said Al-Khudri (May Allah be pleased with him) reported: The Messenger of Allah [SAWW](PBUH) said, "Allah, the Rubb of honour and glory, will say to the inhabitants of Jannah: `O inhabitants of Jannah!' They will respond: `Here we are! At Your service, O our Rubb. All good is in Your Hand!' He will ask them: `Are you pleased?' They will reply: `Why should we not be pleased, O Rubb, when You have given us what You have not given to any of Your creatures?' Allah will say: `Shall I not give you something better than that?' They will ask: `O Rubb! What can be better than that?' Allah will say: `I shall bestow My Pleasure upon you and I shall never be displeased with you.'''

[Al-Bukhari Book 08, Chapter 76, Hadith # 557]. 

Lesson : as mentioned above in Surah Al-Furqan Ayat 16."there (in Jannah) will be therein all that they desire, and they will abide (there forever)" The declaration about Allah being pleased with the dwellers of Jannah will certainly be the greatest of the boons and rewards of Jannah.