Narrated Abu Hazim: I asked Sahl bin Sa`d, "Did Allah's Messenger (ﷺ) ever eat white flour?" Sahl said, "Allah's Messenger (ﷺ) never saw white flour since Allah sent him as an Apostle till He took him unto Him." I asked, "Did the people have (use) sieves during the lifetime of Allah's Messenger?" Sahl said, "Allah's Messenger (ﷺ) never saw (used) a sieve since Allah sent him as an Apostle until He took him unto Him," I said, "How could you eat barley unsifted?" he said, "We used to grind it and then blow off its husk, and after the husk flew away, we used to prepare the dough (bake) and eat it."
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا يَعْقُوبُ، عَنْ أَبِي حَازِمٍ، قَالَ سَأَلْتُ سَهْلَ بْنَ سَعْدٍ فَقُلْتُ هَلْ أَكَلَ رَسُولُ اللَّهِ صلى الله عليه وسلم النَّقِيَّ فَقَالَ سَهْلٌ مَا رَأَى رَسُولُ اللَّهِ صلى الله عليه وسلم النَّقِيَّ مِنْ حِينَ ابْتَعَثَهُ اللَّهُ حَتَّى قَبَضَهُ اللَّهُ. قَالَ فَقُلْتُ هَلْ كَانَتْ لَكُمْ فِي عَهْدِ رَسُولِ اللَّهِ صلى الله عليه وسلم مَنَاخِلُ قَالَ مَا رَأَى رَسُولُ اللَّهِ صلى الله عليه وسلم مُنْخُلاً مِنْ حِينَ ابْتَعَثَهُ اللَّهُ حَتَّى قَبَضَهُ. قَالَ قُلْتُ كَيْفَ كُنْتُمْ تَأْكُلُونَ الشَّعِيرَ غَيْرَ مَنْخُولٍ قَالَ كُنَّا نَطْحَنُهُ وَنَنْفُخُهُ، فَيَطِيرُ مَا طَارَ وَمَا بَقِيَ ثَرَّيْنَاهُ فَأَكَلْنَاهُ.
sunnah.com