Muwatta Malik 1704
موطأ مالك#1704SahihThese are the words of a Companion, not of the Prophet ﷺ. The chain is graded on its own terms.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، أَنَّهُ قَالَ سَمِعْتُ الْقَاسِمَ بْنَ مُحَمَّدٍ، يَقُولُ جَاءَ رَجُلٌ إِلَى عَبْدِ اللَّهِ بْنِ عَبَّاسٍ فَقَالَ لَهُ إِنَّ لِي يَتِيمًا وَلَهُ إِبِلٌ أَفَأَشْرَبُ مِنْ لَبَنِ إِبِلِهِ فَقَالَ ابْنُ عَبَّاسٍ إِنْ كُنْتَ تَبْغِي ضَالَّةَ إِبِلِهِ وَتَهْنَأُ جَرْبَاهَا وَتَلُطُّ حَوْضَهَا وَتَسْقِيهَا يَوْمَ وِرْدِهَا فَاشْرَبْ غَيْرَ مُضِرٍّ بِنَسْلٍ وَلاَ نَاهِكٍ فِي الْحَلْبِ .
Yahya related to me from Malik that Yahya ibn Said said that he had heard al-Qasim ibn Muhammad say that a man came to Abdullah ibn Abbas and said to him, "I have an orphan and he has camels. Can I drink from the camels' milk?" Ibn Abbas said, "If you search for the lost camels of his and treat the camels' mange and fill in the cracks in their water basin and give it water on the day it drinks, then drink it without doing harm to the suckling camels by milking them excessively
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 49:34