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

Ezra 9:6
And said, O my God, I am ashamed and blush to lift up my face to thee, my God: for our iniquities are increased over our head, and our trespass is grown up unto the heavens.

Jeremiah 6:15
Were they ashamed when they had committed abomination? nay, they were not at all ashamed, neither could they blush: therefore they shall fall among them that fall: at the time that I visit them they shall be cast down, saith the LORD.

Jeremiah 8:12
Were they ashamed when they had committed abomination? nay, they were not at all ashamed, neither could they blush: therefore shall they fall among them that fall: in the time of their visitation they shall be cast down, saith the LORD.