Musnad Ahmad 1286:0

The Hadith of Hawwa’, the grandmother of ‘Amr ibn Mu‘adh: ‘Amr ibn Mu‘adh reported from his grandmother, Hawwa’, that she said: The Messenger of Allah (ﷺ) said: "O women of the believers, do not consider any favor too small to give to your neighbor, even if it is the hoof of a sheep."