Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Yeast in a dream is money that grows and increases. Whoever sees himself putting it in dough will gain a profit in his trade.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Yeast indicates blessing in wealth and children. Dough without yeast is money that does not grow.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Yeast is interpreted as lawful money. Whoever sees himself eating it will fall ill.