Hadith: Allah Almighty will say to the dwellers of Paradise: 'O people of Paradise!' They will reply: 'O our Lord, we present ourselves and are at Your pleasure.' He will say: ‘Are you contented?’ They will say: 'How could we not be contented, O Lord, when You have given us what You have not given to any of Your creation?'

عَنْ أَبِي سَعِيدٍ الخُدْرِيِّ رضي الله عنه قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ:
«إِنَّ اللَّهَ تَبَارَكَ وَتَعَالَى يَقُولُ لِأَهْلِ الجَنَّةِ: يَا أَهْلَ الجَنَّةِ؟ فَيَقُولُونَ: لَبَّيْكَ رَبَّنَا وَسَعْدَيْكَ، فَيَقُولُ: هَلْ رَضِيتُمْ؟ فَيَقُولُونَ: وَمَا لَنَا لاَ نَرْضَى وَقَدْ أَعْطَيْتَنَا مَا لَمْ تُعْطِ أَحَدًا مِنْ خَلْقِكَ؟ فَيَقُولُ: أَنَا أُعْطِيكُمْ أَفْضَلَ مِنْ ذَلِكَ، قَالُوا: يَا رَبِّ، وَأَيُّ شَيْءٍ أَفْضَلُ مِنْ ذَلِكَ؟ فَيَقُولُ: أُحِلُّ عَلَيْكُمْ رِضْوَانِي، فَلاَ أَسْخَطُ عَلَيْكُمْ بَعْدَهُ أَبَدًا».
[صحيح] - [متفق عليه] - [صحيح البخاري: 6549]

Abu Sa‘īd al-Khudri (may Allah be pleased with him) reported: The Messenger of Allah (may Allah's peace and blessings be upon him) said:
"Allah Almighty will say to the dwellers of Paradise: 'O people of Paradise!' They will reply: 'O our Lord, we present ourselves and are at Your pleasure.' He will say: ‘Are you contented?’ They will say: 'How could we not be contented, O Lord, when You have given us what You have not given to any of Your creation?' He will say: 'I shall give you something better than that?’ They will say: 'O Lord, what could be better than that?' He will say: 'I shall bestow My pleasure upon you and I shall not be displeased with you ever after that.'"
[Authentic hadith] - [Narrated by Bukhari & Muslim] - [Sahih Bukhari - 6549]

Explanation

The Prophet (may Allah's peace and blessings be upon him) informed that Allah Almighty will say to the people of Paradise while they are in it: O people of Paradise! They will reply: O our Lord, we present ourselves and are at Your pleasure. He will say to them: Are you contented? They will say: Yes, we are contented. How could we not be contented when You have given us what You have not given to any of Your creation! He Almighty will say: Shall I give you something better than that? They will say: O Lord, what could be better than that?! He will say: I shall bestow My eternal pleasure upon you and I shall not be displeased with you ever after that.