There is a terminology called Levirate marriage, a levirate marriage is a type of marriage in which the brother of a deceased man is obliged to marry his brother's widow. The term levirate is itself a derivative of the Latin word levir meaning "husband's brother". Deut 25:5 If brethren dwell together, and one of them die, and have no child, the wife of the dead shall not marry without unto a stranger: her husband's brother shall go in unto her, and take her to him to wife, and perform the duty of an husband's brother unto her. Is this right or wrong and does it meets your moral standards.

The prophets often stated that the messages they delivered were God’s word. For example, Jeremiah introduced his prophetic messages with the expression “the word of Jehovah came to me.” (Jeremiah 1:​4, 11, 13; 2:1)

When do you foresake the word of God; and can there be a moral conviction that challenges the word of God.

If Deuteronomy states that you can marry a deceased brother's wife who are you and under what grounds do you refuse to do it if it is not wrong.

The Bible has been used for centuries by Christians as a weapon of control even if it goes against our morals. To read it literally is to believe for example that God condone slavery, or accept treating women as inferior creatures, and allows mental diseases. What is morally challenging doesn't end in the Old Testament. Luke 14:26 If any man come to me, and hate not his father, and mother, and wife, and children, and brethren, and sisters, yea, and his own life also, he cannot be my disciple. Is that morally acceptable to you.