(22) باب النَّفْخِ فِي الشَّعِيرِ
Narrated Abu Hazim:
that he asked Sahl, "Did you use white flour during the lifetime of the Prophet (ﷺ) ?" Sahl replied, "No. Hazim asked, "Did you use to sift barley flour?" He said, "No, but we used to blow off the husk (of the barley).
Reference: Sahih al-Bukhari 5410
In-book reference: Book 70, Hadith 38
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 7, Book 65, Hadith 321