Deuteronomy 28:47-51

47Because you did not serve the Lord your God joyfully and gladly in the time of prosperity, 48therefore in hunger and thirst, in nakedness and dire poverty, you will serve the enemies the Lord sends against you. He will put an iron yoke on your neck until he has destroyed you. 49The Lord will bring a nation against you from far away, from the ends of the earth, like an eagle swooping down, a nation whose language you will not understand, 50a fierce-looking nation without respect for the old or pity for the young. 51They will devour the young of your livestock and the crops of your land until you are destroyed. They will leave you no grain, new wine or olive oil, nor any calves of your herds or lambs of your flocks until you are ruined.