Deuteronomy 29:18-19

18Make sure there is no man or woman, clan or tribe among you today whose heart turns away from the LORD our God to go and worship the gods of those nations. Make sure there is no root among you that bears such poisonous and bitter fruit,1 19because when such a person hears the words of this oath,2 he invokes a blessing on himself, saying, ‘I will have peace, even though I walk in the stubbornness of my own heart.’

This will bring disaster on the watered land as well as the dry.