Jeremiah 32:22
וַתִּתֵּן לָהֶם אֶת הָאָרֶץ הַזֹּאת אֲשֶׁר נִשְׁבַּעְתָּ לַאֲבוֹתָם לָתֵת לָהֶם אֶרֶץ זָבַת חָלָב וּדְבָשׁ
You gave them this land that You swore to their fathers to give them, a land flowing with milk and honey.
How exactly does a land flow with milk? The Metzudas David explains that the fields where the cattle graze are so fertile that the cows’ milk is abundant and flows from their udders.