Sayyiduna Abu Hurayrah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) "permitted estimation in the 'araya sale in five wasqs or less." Imam Malik (may Allah have mercy on him) said: Yes.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10667