Shama-il Tirmidhi Chapter 024, Hadith Number 004 (138).
Someone asked Sahl bin Sa'd Radiyallahu 'Anhu "Did Rasulullah Sallailahu 'Alayhi Wasallam ever eat bread made of white (fine) flour?" He replied: White flour may not have come before Rasulullah Sallailahu 'Alayhi Wasallam till his last days". The questioner then asked: "Did you people use sieved flour in the time of Rasulullah Sallailahu 'Alayhi Wasallam?"
He replied: "No, it was not". The questioner then asked: "How was bread from barley prepared?" (because it has more particles in it). Sahl Radiyallahu Anhu replied: "We used to blow into the flour and the big particles flew out. The rest was made into dough".
Allah! Allah is everlasting. Today it is difficult for us to eat even wheat flour that is not sifted. Whereas un-sifted flour is good for digestion. Bread made of fine flour although being heavy (and difficult to digest) has become common. Many homes, because of luxury have kept up this wasteful practice. Some 'ulama have written that the first bid'ah that crept into Islaam was the use of a sieve. This bid'ah should not be confused with shar'ee bid'ah, which is against the sunnah. It is being called bid'ah in view of new trends. it is undoubtedly jaaiz (permissible).