Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Milk (laban) in a dream is lawful money and the natural disposition (Fitra) of Islam. Milk from livestock is good, lawful sustenance. Human milk indicates illness. Bird's milk indicates wealth from travel. Sour milk (buttermilk/ra'ib) is unlawful money or sustenance obtained with trouble and fatigue.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Milk indicates knowledge, religion, and lawful sustenance. Whoever sees himself drinking mare's milk will receive goodness from the ruler, who will love him. Milking a she-camel and drinking its milk indicates marrying a righteous woman and gaining lawful wealth. Milk overflowing from the breast is an increase in sustenance and blessing.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Milk is interpreted as wealth and sustenance. Drinking it for a scholar is an increase in his knowledge, for a ruler, justice in his rule, and for a merchant, profit in his trade. Milk mixed with blood is unlawful money. Bathing in milk indicates wealth, luxury, and adherence to the sound natural disposition.