Deuteronomy 28:47-50

47“Because you did not serve the Lord your God with joy and gladness of heart, for the abundance of everything,

48therefore you shall serve your enemies, whom the Lord will send against you, in hunger, in thirst, in nakedness, and in need of everything; and He will put a yoke of iron on your neck until He has destroyed you.

49The Lord will bring a nation against you from afar, from the end of the earth, as swift as the eagle flies, a nation whose language you will not understand,

50a nation of fierce countenance, which does not respect the elderly nor show favor to the young.