Be generous with our gifts without expecting anything in return; once we give something away, do not expect or demand them again.

This hadith speaks about the unacceptability of taking back gifts that have been given away. It is narrated from Ibn 'Umar and Ibn 'Abbas, who attributed it to the Prophet that it is not permissible for someone to give a gift and then take it back, except in cases where a father takes back what he has given his son. The hadith uses an analogy of a dog which eats until it is full and then vomits before going back to its vomit as an example of how unacceptable this act is. This hadith teaches us that we should be generous with our gifts without expecting anything in return; once we give something away, we should not expect or demand it back again.