Musnad Ahmad 1286:1

Rawh narrated to us, Malik ibn Anas informed us, from Zayd ibn Aslam, from ‘Amr ibn Mu‘adh al-Ashhali, from his grandmother, that she said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "O believing women, let no one among you belittle [a gift] for her neighbor, even if it be a charred sheep’s trotter."