Sahih Muslim Book - 1, Hadith - 453

و حَدَّثَنَا مُحَمَّدُ بْنُ رَافِعٍ حَدَّثَنَا عَبْدُ الرَّزَّاقِ أَخْبَرَنَا مَعْمَرٌ عَنْ هَمَّامِ بْنِ مُنَبِّهٍ قَالَ هَذَا مَا حَدَّثَنَا أَبُو هُرَيْرَةَ عَنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَذَكَرَ أَحَادِيثَ مِنْهَا وَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِنَّ أَدْنَى مَقْعَدِ أَحَدِكُمْ مِنْ الْجَنَّةِ أَنْ يَقُولَ لَهُ تَمَنَّ فَيَتَمَنَّى وَيَتَمَنَّى فَيَقُولُ لَهُ هَلْ تَمَنَّيْتَ فَيَقُولُ نَعَمْ فَيَقُولُ لَهُ فَإِنَّ لَكَ مَا تَمَنَّيْتَ وَمِثْلَهُ مَعَهُ.

Hammam bin Munabbih said: "This is what Abu Hurairah narrated from the Messenger of Allah (s.a.w)," and he quoted a Hadith, among which he said: "And the Messenger of Allah (s.a.w) said: 'It will be said to the least among you in Paradise: 'Wish (for whatever you want),' and he will wish and wish, then it will be said to him: 'Have you finished wishing?' He will say: 'Yes.' It will be said: 'You will have what you wished for and as much again.'"