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. (RU)
Reference (RU): Sahih Muslim 979 e (RU)
In-book reference (RU): Book 12, Hadith 5 (RU)
USC-MSA web (English) reference(deprecated numbering scheme): Book 5, Hadith 2138 (RU)