Sahih Muslim Book - 1, Hadith - 529

حَدَّثَنَا هَنَّادُ بْنُ السَّرِيِّ حَدَّثَنَا أَبُو الْأَحْوَصِ عَنْ أَبِي إِسْحَاقَ عَنْ عَمْرِو بْنِ مَيْمُونٍ عَنْ عَبْدِ اللَّهِ قَالَ قَالَ لَنَا رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَمَا تَرْضَوْنَ أَنْ تَكُونُوا رُبُعَ أَهْلِ الْجَنَّةِ؟ قَالَ فَكَبَّرْنَا ثُمَّ قَالَ أَمَا تَرْضَوْنَ أَنْ تَكُونُوا ثُلُثَ أَهْلِ الْجَنَّةِ قَالَ فَكَبَّرْنَا ثُمَّ قَالَ إِنِّي لَأَرْجُو أَنْ تَكُونُوا شَطْرَ أَهْلِ الْجَنَّةِ وَسَأُخْبِرُكُمْ عَنْ ذَلِكَ مَا الْمُسْلِمُونَ فِي الْكُفَّارِ إِلَّا كَشَعْرَةٍ بَيْضَاءَ فِي ثَوْرٍ أَسْوَدَ أَوْ كَشَعْرَةٍ سَوْدَاءَ فِي ثَوْرٍ أَبْيَضَ.

It was narrated that 'Abdullah said: "The Messenger of Allah (s.a.w) said to us: 'Would it not please you to be one-quarter of the people of Paradise?' We glorified Allah (i.e. said Allahu Akbar in elation), then he said: 'Would it not please you to be one-third of the people of Paradise?' We said Allahu Akbar, then he said: 'I hope that you will be half of the people of Paradise, and I will tell you about that. The Muslims among the disbelievers are like a white hair on a black bull, or like a black hair on a white bull."'