Sahih (Sahih Muslim)
وَحَدَّثَنَاهُ عَبْدُ اللَّهِ بْنُ عَبْدِ الرَّحْمَنِ الدَّارِمِيُّ، حَدَّثَنَا مُحَمَّدُ بْنُ يُوسُفَ، عَنِ الأَوْزَاعِيِّ، بِهَذَا الإِسْنَادِ . مِثْلَهُ غَيْرَ أَنَّهُ قَالَ " إِنَّ اللَّهَ لَنْ يَتِرَكَ مِنْ عَمَلِكَ شَيْئًا " . وَزَادَ فِي الْحَدِيثِ قَالَ " فَهَلْ تَحْلُبُهَا يَوْمَ وِرْدِهَا " . قَالَ نَعَمْ .
This tradition has been handed down through a different chain of transmitter with the addition of the following words at the end:" Do you milk them on the day they arrive at the water? He replied: Yes