Sahih Bukhari Volume 3, Book 37, Hadith 2269

حَدَّثَنَا سُلَيْمَانُ بْنُ حَرْبٍ، حَدَّثَنَا حَمَّادٌ، عَنْ أَيُّوبَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏"‏ مَثَلُكُمْ وَمَثَلُ أَهْلِ الْكِتَابَيْنِ كَمَثَلِ رَجُلٍ اسْتَأْجَرَ أُجَرَاءَ فَقَالَ مَنْ يَعْمَلُ لِي مِنْ غُدْوَةَ إِلَى نِصْفِ النَّهَارِ عَلَى قِيرَاطٍ فَعَمِلَتِ الْيَهُودُ، ثُمَّ قَالَ مَنْ يَعْمَلُ لِي مِنْ نِصْفِ النَّهَارِ إِلَى صَلاَةِ الْعَصْرِ عَلَى قِيرَاطٍ فَعَمِلَتِ النَّصَارَى ثُمَّ، قَالَ مَنْ يَعْمَلُ لِي مِنَ الْعَصْرِ إِلَى أَنْ تَغِيبَ الشَّمْسُ عَلَى قِيرَاطَيْنِ فَأَنْتُمْ هُمْ، فَغَضِبَتِ الْيَهُودُ وَالنَّصَارَى، فَقَالُوا مَا لَنَا أَكْثَرَ عَمَلاً، وَأَقَلَّ عَطَاءً قَالَ هَلْ نَقَصْتُكُمْ مِنْ حَقِّكُمْ قَالُوا لاَ‏.‏ قَالَ فَذَلِكَ فَضْلِي أُوتِيهِ مَنْ أَشَاءُ ‏"‏‏

Narrated By Ibn 'Umar : The Prophet said, "Your example and the example of the people of the two Scriptures (i.e. Jews and Christians) is like the example of a man who employed some labourers and asked them, 'Who will work for me from morning till midday for one Qirat?' The Jews accepted and carried out the work. He then asked, Who will work for me from midday up to the 'Asr prayer for one Qirat?' The Christians accepted and fulfilled the work. He then said, 'Who will work for me from the 'Asr till sunset for two Qirats?' You, Muslims have accepted the offer. The Jews and the Christians got angry and said, 'Why should we work more and get lesser wages?' (Allah) said, 'Have I with-held part of your right?' They replied in the negative. He said, 'It is My Blessing, I bestow upon whomever I wish.'