Allah states that He does not treat any of His servants with injustice on the Day of Resurrection, be it the weight of a mustard seed or a speck of dust. Rather, Allah shall reward them for this action and multiply it, if it were a good deed. For instance, Allah said,

﴿وَنَضَعُ الْمَوَزِينَ الْقِسْطَ﴾

(And We shall set up balances of justice) Allah said that Luqman said,

﴿يبُنَىَّ إِنَّهَآ إِن تَكُ مِثْقَالَ حَبَّةٍ مِّنْ خَرْدَلٍ فَتَكُنْ فِى صَخْرَةٍ أَوْ فِى السَّمَـوَتِ أَوْ فِى الاٌّرْضِ يَأْتِ بِهَا اللَّهُ﴾

(O my son! If it be (anything) equal to the weight of a mustard seed, and though it be in a rock, or in the heavens or in the earth, Allah will bring it forth). Allah said,

﴿يَوْمَئِذٍ يَصْدُرُ النَّاسُ أَشْتَاتاً لِّيُرَوْاْ أَعْمَـلَهُمْ - فَمَن يَعْمَلْ مِثْقَالَ ذَرَّةٍ خَيْراً يَرَهُ - وَمَن يَعْـمَلْ مِثْقَالَ ذَرَّةٍ شَرّاً يَرَهُ ﴾

(That Day mankind will proceed in scattered groups that they may be shown their deeds. So whosoever does good equal to the weight of a speck of dust shall see it. And whosoever does evil equal to the weight of a speck of dust shall see it.) The Two Sahihs recorded the long Hadith about the intercession that Abu Sa`id Al-Khudri narrated, and in which the Messenger of Allah said,

«فَيَقُولُ اللهُ عَزَّ وَجَلَّ: ارْجِعُوا، فَمَنْ وَجَدْتُمْ فِي قَلْبِهِ مِثْقَالَ حَبَّةِ خَرْدَلٍ مِنْ إِيمَانٍ، فَأَخْرِجُوهُ مِنَ النَّار»

(Allah then says, "Go back, and take out of the Fire everyone in whose heart you find the weight of a mustard seed of faith'') In another narration, Allah says, وفي لفظ:

«أَدْنَى أَدْنَى أَدْنَى مِثْقَالِ ذَرَّةٍ مِنْ إِيمَانٍ، فَأَخْرِجُوهُ مِنَ النَّارِ، فَيُخْرِجُونَ خَلْقًا كَثِيرًا»

("Whosoever had the least, least, least speck of faith, take him out of the Fire,'' and they will take out many people.) Abu Sa`id then said, "Read, if you will,

﴿إِنَّ اللَّهَ لاَ يَظْلِمُ مِثْقَالَ ذَرَّةٍ﴾

(Surely! Allah wrongs not even of the weight of a speck of dust).''