The Messenger of Allah ﷺ came upon a stream from the sky on a hot day while the people were fasting and walking on foot, and the Prophet of Allah was on his mule. He said, "Drink, people."They refused.He said, "I am not like you. I am the most at ease among you, for I am riding."Still they refused.So the Messenger of Allah ﷺ bent his thigh and dismounted, then drank, and the people drank, though he had not wanted to drink.
حدثنا عبد الصمد حدثني أبي حدثنا الجريري عن أبي نضرة
أتى رسول الله ﷺ على نهر من السماء والناس صيام في يوم صائف مشاة ونبي الله على بغلة له فقال اشربوا أيها الناس قال فأبوا قال إني لست مثلكم إني أيسركم إني راكب فأبوا قال فثنى رسول الله ﷺ فخذه فنزل فشرب وشرب الناس وما كان يريد أن يشرب
Its isnad is sahih. The hadith was mentioned previously at 11103.