Abu Sa'id al-Khudri reported Allah's Messenger (ﷺ) as saying:
No Sadaqa is payable on less than five wasqs of dates or grains. (JA)
Reference (JA): Sahih Muslim 979 e (JA)
In-book reference (JA): Book 12, Hadith 5 (JA)
USC-MSA web (English) reference(deprecated numbering scheme): Book 5, Hadith 2138 (JA)