Abu Sa'id al-Khudri said, "Once when we were on a journey with the Prophet, a man came on a camel of his and began to look to his right and left. The Messenger of Allah, may Allah bless him and grant him peace, said, "Anyone who has a spare mount should prepare it for someone who does not have a mount to ride, and anyone who has extra provision should prepare it for someone who does not have any provision," and he mentioned the different categories of property until we thought that none of us had any right to anything in excess of our needs."

Riyadh-as-Saliheen by Imam Al-Nawawi, 566 - Sunni Hadith