Sayyiduna Abu Hurayrah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) permitted the 'araya sale, provided that "the estimate in it is for five wasqs or less." Dawud the narrator was unsure whether he said "five" or "less than five wasqs." He said: Yes.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10665