Narrated Samura bin Jundab:

Allah's Messenger (ﷺ) said, "Tonight two (visitors) came to me (in my dream) and took me to a town built with gold bricks and silver bricks. There we met men who, half of their bodies, look like the mosthandsome human beings you have ever seen, and the other half, the ugliest human beings you have ever seen. Those two visitors said to those men, 'Go and dip yourselves in that river. So they dipped themselves therein and then came to us, their ugliness having disappeared and they were in the mosthandsome shape. The visitors said, 'The first is the Garden of Eden and that is your dwelling place.' Then they added, 'As for those people who were half ugly and half handsome, they were those who mixed good deeds and bad deeds, but Allah forgave them."

حَدَّثَنَا مُؤَمَّلٌ ـ هُوَ ابْنُ هِشَامٍ ـ حَدَّثَنَا إِسْمَاعِيلُ بْنُ إِبْرَاهِيمَ، وَحَدَّثَنَا عَوْفٌ، حَدَّثَنَا أَبُو رَجَاءٍ، حَدَّثَنَا سَمُرَةُ بْنُ جُنْدُبٍ ـ رضى الله عنه ـ قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم لَنَا ‏ "‏ أَتَانِي اللَّيْلَةَ آتِيَانِ فَابْتَعَثَانِي، فَانْتَهَيْنَا إِلَى مَدِينَةٍ مَبْنِيَّةٍ بِلَبِنِ ذَهَبٍ وَلَبِنِ فِضَّةٍ، فَتَلَقَّانَا رِجَالٌ شَطْرٌ مِنْ خَلْقِهِمْ كَأَحْسَنِ مَا أَنْتَ رَاءٍ، وَشَطْرٌ كَأَقْبَحِ مَا أَنْتَ رَاءٍ قَالاَ لَهُمُ اذْهَبُوا فَقَعُوا فِي ذَلِكَ النَّهْرِ‏.‏ فَوَقَعُوا فِيهِ ثُمَّ رَجَعُوا إِلَيْنَا قَدْ ذَهَبَ ذَلِكَ السُّوءُ عَنْهُمْ، فَصَارُوا فِي أَحْسَنِ صُورَةٍ قَالاَ لِي هَذِهِ جَنَّةُ عَدْنٍ، وَهَذَاكَ مَنْزِلُكَ قَالاَ أَمَّا الْقَوْمُ الَّذِينَ كَانُوا شَطْرٌ مِنْهُمْ حَسَنٌ وَشَطْرٌ مِنْهُمْ قَبِيحٌ فَإِنَّهُمْ خَلَطُوا عَمَلاً صَالِحًا وَآخَرَ سَيِّئًا تَجَاوَزَ اللَّهُ عَنْهُمْ ‏"‏‏.‏
Reference : Sahih al-Bukhari 4674
In-book reference : Book 65, Hadith 196
USC-MSA web (English) reference : Vol. 6, Book 60, Hadith 196
  (deprecated numbering scheme)