Sahih Bukhari Volume 1, Book 9, Hadith 558

حَدَّثَنَا أَبُو كُرَيْبٍ، قَالَ حَدَّثَنَا أَبُو أُسَامَةَ، عَنْ بُرَيْدٍ، عَنْ أَبِي بُرْدَةَ، عَنْ أَبِي مُوسَى، عَنِ النَّبِيِّ صلى الله عليه وسلم ‏"‏ مَثَلُ الْمُسْلِمِينَ وَالْيَهُودِ وَالنَّصَارَى كَمَثَلِ رَجُلٍ اسْتَأْجَرَ قَوْمًا يَعْمَلُونَ لَهُ عَمَلاً إِلَى اللَّيْلِ، فَعَمِلُوا إِلَى نِصْفِ النَّهَارِ، فَقَالُوا لاَ حَاجَةَ لَنَا إِلَى أَجْرِكَ، فَاسْتَأْجَرَ آخَرِينَ فَقَالَ أَكْمِلُوا بَقِيَّةَ يَوْمِكُمْ، وَلَكُمُ الَّذِي شَرَطْتُ، فَعَمِلُوا حَتَّى إِذَا كَانَ حِينَ صَلاَةِ الْعَصْرِ قَالُوا لَكَ مَا عَمِلْنَا‏.‏ فَاسْتَأْجَرَ قَوْمًا فَعَمِلُوا بَقِيَّةَ يَوْمِهِمْ حَتَّى غَابَتِ الشَّمْسُ، وَاسْتَكْمَلُوا أَجْرَ الْفَرِيقَيْنِ ‏"

Narrated By Abu Musa : The Prophet said, "The example of Muslims, Jews and Christians is like the example of a man who employed labourers to work for him from morning till night. They worked till mid-day and they said, 'We are not in need of your reward.' SO the man employed another batch and said to them, 'Complete the rest of the day and yours will be the wages I had fixed (for the first batch). They worked Up till the time of the 'Asr prayer and said, 'Whatever we have done is for you.' He employed another batch. They worked for the rest of the day till sunset, and they received the wages of the two former batches."