Sayyiduna Wathilah (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) made a call for the Tabuk campaign. I went to my family, and when I came back, the first of his (peace and blessings be upon him) companions had already left. I went around Madinah announcing: Whoever gives a man a mount, the man's share will belong to the one who gives the mount. An elderly man of the Ansar said: His share will be ours; in return we will give him a mount, and his food will be with us. I accepted, and he said: Then go with the blessing of Allah. I set out with the best of companions, until we gained wealth without fighting, and I received some young she-camels. I drove them along until I came to him. He came out and sat on one of the saddlebags of his camels, then said: Drive them going away. Then he said: Drive them coming forward. And he said: Your she-camels are excellent. I said: This is the gain that I stipulated for you; this booty is yours. He said: O son of my brother! Take your she-camels; it was something other than your share that we wanted. The Shaykh (may Allah have mercy on him) said: The words "it was something other than your share that we wanted" mean that we did not want a share by way of hire; rather, our aim was to share in the reward and recompense.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 17846