Sayyiduna Abu Sa'id (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 uqiyahs of silver, and there is no zakah on less than five camels." Sufyan (may Allah have mercy on him) said: An uqiyah is forty dirhams.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7513
Sufyan (may Allah have mercy on him) said: I asked Amr bin Yahya bin Umarah, and he mentioned this hadith, narrating it from his father, and added: "There is no zakah on less than five wasqs."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7514
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 uqiyahs of silver, nor is there zakah on less than five camels, nor is there zakah on less than five wasqs of dates."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7515
Abu Sa'id al-Khudri (may Allah be pleased with him) said that he heard the Messenger of Allah (peace and blessings be upon him) say: "There is no zakah on less than five wasqs of dates, nor is there zakah on less than five uqiyahs of silver, nor is there zakah on less than five camels." Abu Usamah was asked to confirm this, and he said: Yes, that is so.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7516