Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "There is no zakah on less than five uqiyah of silver, there is no zakah on less than five wasq of dates, and there is no zakah on less than five camels either."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7421
Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) narrates a similar hadith from the Messenger of Allah (peace and blessings be upon him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7422
The two sons of Jabir narrate from Sayyiduna Jabir (may Allah be pleased with him), from the Prophet (peace and blessings be upon him), that he (peace and blessings be upon him) said: "There is no zakah on less than five wasq, there is no zakah on less than five uqiyah, and there is no zakah on less than five camels."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7423
Abdullah bin Umar (may Allah be pleased with them both) said that the Messenger of Allah (peace and blessings be upon him) said: "There is no zakah on less than five wasq (20 maunds)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7424
Abu Bakr bin Muhammad bin Amr bin Hazm narrates from his father, and he from his grandfather, that he (peace and blessings be upon him) wrote in the letter he sent to the people of Yemen: "Land that is watered by the sky, or is rain-fed, or is elevated land, a tenth is due on it when its produce reaches five wasq; and land that is watered by hand or by water drawn up and poured, half a tenth is due on it when its produce reaches five wasq."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7425
Sayyiduna Abu Umamah bin Sahl bin Hunayf (may Allah be pleased with him) stated in the gathering of Sa'id bin al-Musayyib (may Allah have mercy on him) that the Sunnah has been established that "zakah is not to be collected from date palms until their estimated yield reaches five wasq."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7426