Abdullah b. Mas'ud reported:

The Messenger of Allah (ﷺ) addressing us said: Aren't you pleased that you should constitute one-fourth of the inhabitants of Paradise? He (the narrator) said: We glorified (our Lord, i. e. we called aloud Allah-o Akbar, Allah is the Greatest). He, then, again said: Aren't you pleased that you should constitute one-third of the inhabitants of Paradise? He (the narrator) said: We glorified (our Lord) and he (the Prophet) then again said: I hope that you would constitute half of the inhabitants of Paradise and I shall explain to you its (reason). The believers among the unbelievers would not be more than a white hair on (the body of a) black ox or a black hair on (the body of a) white ox.

حَدَّثَنَا هَنَّادُ بْنُ السَّرِيِّ، حَدَّثَنَا أَبُو الأَحْوَصِ، عَنْ أَبِي إِسْحَاقَ، عَنْ عَمْرِو بْنِ مَيْمُونٍ، عَنْ عَبْدِ اللَّهِ، قَالَ قَالَ لَنَا رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ أَمَا تَرْضَوْنَ أَنْ تَكُونُوا رُبُعَ أَهْلِ الْجَنَّةِ ‏"‏ قَالَ فَكَبَّرْنَا ‏.‏ ثُمَّ قَالَ ‏"‏ أَمَا تَرْضَوْنَ أَنْ تَكُونُوا ثُلُثَ أَهْلِ الْجَنَّةِ ‏"‏ قَالَ فَكَبَّرْنَا ‏.‏ ثُمَّ قَالَ ‏"‏ إِنِّي لأَرْجُو أَنْ تَكُونُوا شَطْرَ أَهْلِ الْجَنَّةِ وَسَأُخْبِرُكُمْ عَنْ ذَلِكَ مَا الْمُسْلِمُونَ فِي الْكُفَّارِ إِلاَّ كَشَعْرَةٍ بَيْضَاءَ فِي ثَوْرٍ أَسْوَدَ أَوْ كَشَعْرَةٍ سَوْدَاءَ فِي ثَوْرٍ أَبْيَضَ ‏"‏ ‏.‏