Verses with the word sinful in the Old Testament (3 verses):

Numbers 32:14
And, behold, ye are risen up in your fathers' stead, an increase of sinful men, to augment yet the fierce anger of the LORD toward Israel.

Isaiah 1:4
Ah sinful nation, a people laden with iniquity, a seed of evildoers, children that are corrupters: they have forsaken the LORD, they have provoked the Holy One of Israel unto anger, they are gone away backward.

Amos 9:8
Behold, the eyes of the Lord GOD are upon the sinful kingdom, and I will destroy it from off the face of the earth; saving that I will not utterly destroy the house of Jacob, saith the LORD.