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

Genesis 37:33
And he knew it, and said, It is my son's coat; an evil beast hath devoured him; Joseph is without doubt rent in pieces.

Deuteronomy 28:66
And thy life shall hang in doubt before thee; and thou shalt fear day and night, and shalt have none assurance of thy life:

Job 12:2
No doubt but ye are the people, and wisdom shall die with you.