Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Flour in a dream is collected lawful money and immediate sustenance. Wheat flour indicates justice and fertility, and barley flour indicates religion and piety.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Flour indicates useful knowledge. Kneading it indicates an impending journey.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Flour is interpreted as lawful money. Whoever sees himself selling it is selling his religion for his world.