The Messenger of Allah ﷺ said, "Allah will say to the people of Paradise, 'People of Paradise!'They will reply, 'Here we are, our Lord, at Your service.'He will ask, 'Are you pleased?'They will answer, 'How could we not be pleased, when You have given us what You have not given to any of Your creation?'He will say, 'I shall give you something even better than that.'They will ask, 'Our Lord, what could be better than that?'He will say, 'I shall bestow My pleasure upon you, and I shall never be displeased with you thereafter.'"
حدثنا علي بن إسحاق أخبرنا عبد الله حدثنا مالك بن أنس عن زيد بن أسلم عن عطاء بن يسار
قال رسول الله ﷺ إن الله يقول لأهل الجنة يا أهل الجنة فيقولون لبيك ربنا وسعديك فيقول هل رضيتم فيقولون وما لنا لا نرضى وقد أعطيتنا ما لم تعط أحدا من خلقك فيقول أنا أعطيكم أفضل من ذلك قالوا يا ربنا فأي شيء أفضل من ذلك قال أحل عليكم رضواني فلا أسخط بعده أبدا
Its isnad is sahih, its narrators are leading authorities.The hadith was narrated by Bukhari, 8/142, in the chapter on Riqaq, on the description of Paradise and Hellfire, and by Muslim, 4/2176, no. 2829, in the chapter on Paradise, on the granting of divine pleasure, and by Tirmidhi, 4/289, no. 2555, similarly to Muslim, and he said, hasan sahih.