So you had the answer all along! Although I believe you are refering to chapter 4, not 3. At least the Book of Joel that we have has these quotes in Chapter 4.
1 For behold, in those days and in that time when I return the captivity of Judah and Jerusalem, 2I will gather all the nations and I will take them down to the Valley of Jehoshaphat, and I will contend with them there concerning My people and My heritage, Israel, which they scattered among the nations, and My land they divided.
(He will descend with them to the depths of Justice. THe Judgments of God).
3 And upon My people they cast lots, and they gave a boy for a harlot, and a girl they sold for wine, and they drank. (cast lots, as in stones? (See Lamentation 3:53)