It is narrated from Hazrat Zaid bin Thabit that the Holy Prophet (peace and blessings be upon him) permitted in "Bay' Araya" that it may be sold by estimation of measure. Benefit: For clarification of Bay' Araya, see Hadith number (4490).
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 21583