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"And (remember) when Allaah took the Covenant of the Prophets, saying: "Take whatever I gave you from the Book and Hikmah (understanding of the Laws of Allaah, etc.), and afterwards there will come to you a Messenger (Muhammad sal-Allaahu 'alayhe wa sallam) confirming what is with you; you must, then, believe in him and help him." Allaah said: "Do you agree (to it) and will you take up My Covenant (which I conclude with you)?" They said: "We agree." He said: "Then bear witness; and I am with you among the witnesses (for this)."" [Aal-'Imraan (3):81]

Narrated Zaid bin Khalid Al-Juhani:

A man asked the Prophet about the picking up of a "Luqata" (fallen lost thing). The Prophet replied, "Recognize and remember its tying material and its container, and make public announcement (about it) for one year, then utilize it but give it to its owner if he comes." Then the person asked about the lost camel. On that, the Prophet got angry and his cheeks or his Face became red and he said, "You have no concern with it as it has its water container, and its feet and it will reach water, and eat (the leaves) of trees till its owner finds it." The man then asked about the lost sheep. The Prophet replied, "It is either for you, for your brother (another person) or for the wolf." [The Book of Knowledge Volume 1, Book 3, Hadeeth 91]