39 Heb “and it will come about in that day.”
40 Many English translations read “new wine” or “sweet wine,” meaning unfermented wine, i.e., grape juice.
41 The language used here is a hyperbolic way of describing both a bountiful grape harvest (“the mountains will drip with juice”) and an abundance of cattle (“the hills will flow with milk”). In addition to being hyperbolic, the language is also metonymical (effect for cause).
42 Or “seasonal streams.”
43 Heb “house.”
44 Heb “valley of Shittim.” The exact location of the Valley of Acacia Trees is uncertain. The Hebrew word שִׁטִּים (shittim) refers to a place where the acacia trees grow, which would be a very arid and dry place. The acacia tree can survive in such locations, whereas most other trees require more advantageous conditions. Joel’s point is that the stream that has been mentioned will proceed to the most dry and barren of locations in the vicinity of Jerusalem.

In other versions

“And in that day

the mountains shall drip sweet wine,

and the hills shall flow with milk,

and all the streambeds of Judah

shall flow with water;

and a fountain shall come forth from the house of the Lord

and water the Valley of Shittim.

“In that day the mountains will drip new wine,

and the hills will flow with milk;

all the ravines of Judah will run with water.

A fountain will flow out of the Lord’s house

and will water the valley of acacias.

In that day

the mountains will drip with sweet wine,

and the hills will flow with milk.

All the streams of Judah will flow with water,

and a spring will issue from the Lord’s house,

watering the Valley of Acacias.

In that day the mountains will drip with sweet wine,

and the hills will flow with milk.

Water will fill the streambeds of Judah,

and a fountain will burst forth from the Lord’s Temple,

watering the arid valley of acacias.

And it will happen on that day;

the mountains will drip new wine,

and the hills will flow with milk,

and all the channels of Judah will flow with water.

A spring from the house of Yahweh will come forth,

and it will water the valley of Acacia Trees.

And it shall come to pass in that day,

That the mountains shall drop down new wine,

And the hills shall flow with milk,

And all the rivers of Judah shall flow with waters,

And a fountain shall come forth of the house of the Lord,

And shall water the valley of Shittim.

Public Domain