Sunan an Nasai
2475
Sahih+2

It was narrated from Abu Sa 'eed Al-Khudri that he heard the Messenger of Allah say:"No Sadaqah is due on less than five Awsaq[2] of dates, no Sadaqah is due on less than five Awaq of silver, and no Sadagah is due on less than five Dhawd (head) of camels

SahihAbu Ghuddah
SahihAl-Albani