Hastings' Dictionary of the Bible (1898)
MILK, not only of cows, but also of camels, sheep, and goats, was used in Palestine, and is often spoken of in the O.T. Gen 32:15; Deut 32:14; Prov 27:27; Isa 7:21-22. The simplest spiritual food or the plain and easy truths of the gospel, wherewith the newborn soul is nourished and sustained, is compared to milk. Heb 5:12; 1 Pet 2:2. "A land flowing with milk and honey," Josh 5:6, means a country of extraordinary fertility. The phrase "wine and
milk," Isa 55:1, denotes all spiritual blessings and privileges.