Deuteronomy 32:32
For their vine is of the vine of Sodom, and of the fields of Gomorrah: their grapes are grapes of gall, their clusters are bitter: For their vine is of the vine of Sodom, and of the fields of Gomorrah: their grapes are grapes of gall, their clusters are bitter:
The verse stands in a song that rehearses God's dealings with Israel and reaches prophetically beyond that history to future events, even to the final victory of the faithful when Christ comes in power and glory. Its immediate setting is Israel's rebellion against God, in which the people turned to false gods and forgot the God who formed them, and that unfaithfulness provoked His anger. There it forms part of a prophecy of swift judgment upon those who persist in rebellion, a prophecy that lays bare both God's abhorrence of sin and His love for His people.
The vine of Sodom and the fields of Gomorrah, with grapes of gall and bitter clusters, portray corruption and wickedness, a people whose poisonous and bitter fruit proves their character and works to be unlike those of God's children. That bitter fruit is the bad yield of unfaithfulness, borne instead of reflecting the divine example. It also denotes what rebellion brings with it, for the bitter and poisonous character carries its own consequence in judgment.
The same image applies to God's people whenever their characters become degenerate and evil traits are left unremoved, so that they bear the fruit of Sodom and Gomorrah rather than the Lord's fruit. Then self must be subdued and the evil traits overcome, in order that His vine may again bear good fruit.