Sahih Muslim · Hadith 5356

حدثنا عبيد الله بن معاذ العنبري، حدثنا أبي، حدثنا شعبة، عن أبي إسحاق، عن البراء، قال قال أبو بكر الصديق لما خرجنا مع النبي صلى الله عليه وسلم من مكة إلى المدينة مررنا براع وقد عطش رسول الله صلى الله عليه وسلم قال فحلبت له كثبة من لبن فأتيته بها فشرب حتى رضيت ‏.‏

Abu Bakr Siddiq reported: As we went along with Allah's Messenger (may peace be upon him) from Mecca to Medina, we passed by a shepherd and Allah's Messenger (may peace be upon him) was feeling thirsty. He (Abu Bakr Siddiq) said: I milked for him a small quantity of milk (from his goat) and brought it to him (the Holy Prophet), and he drank it and I was very happy.

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).