Titus 3:9 But avoid foolish controversies, genealogies, dissensions, and quarrels about the law, for they are unprofitable and worthless.

Here is good advice that is often overlooked. We want to be right about important matters, but what makes any matter foolish? One side will insist that a matter is important and the other will disagree.

Some matters have not been resolved over the last 2,000 years. It is unwise of us to think that we can resolve those issues alone. Some of us have been in the faith for decades and have experience in which issues are arguable and which ones are a matter of faith.

Galatians 3:11 Now it is evident that no one is justified before God by the law, for “The righteous shall live by faith.”

When we insist that others believe what we believe we are making a law unto ourselves and those laws will not justify us any more than the ones written in Torah.

Psalm 61:6-8 English Standard Version

6 Prolong the life of the king; may his years endure to all generations! 7 May he be enthroned forever before God; appoint steadfast love and faithfulness to watch over him! 8 So will I ever sing praises to your name, as I perform my vows day after day.

Jesus is the King who sits on the throne. The only vows we are sworn to keep are the ones we make to Him. 

Romans 14:22 The faith that you have, keep between yourself and God. Blessed is the one who has no reason to pass judgment on himself for what he approves.

My understanding of this passage is personal, as is faith. I will not insist that others keep a vow I have made to my Lord and Savior Jesus Christ.

Giving reason for this belief by faith has a point that others might disagree with. I approve of your right to believe by faith an opinion other than my own. That does not say I approve of sin but some will see it that way. I know that because I have heard that very argument.

I defer to Titus 3:9 and choose not to attack another on any issue that is a personal vow to my King. We answer to Him, not each other. 

Deuteronomy 23:21 “If you make a vow to the Lord your God, you shall not delay fulfilling it, for the Lord your God will surely require it of you, and you will be guilty of sin.”

Maybe this is why Jesus encourages us not to make a vow at all.  Matthew 5:34

Ruth 2:20 And Naomi said to her daughter-in-law, “May he be blessed by the Lord, whose kindness has not forsaken the living or the dead!” Naomi also said to her, “The man is a close relative of ours, one of our redeemers.”

Redeemer has multiple meanings in Jewish tradition. Here the word is  gâʼal, gaw-al’; a primitive root, to redeem (according to the Oriental law of kinship), i.e. to be the next of kin (and as such to buy back a relative’s property, marry his widow, etc.) Boaz being a kinsman saw honor in Ruth.

Ruth 3:10 And he said, “May you be blessed by the Lord, my daughter. You have made this last kindness greater than the first in that you have not gone after young men, whether poor or rich.

The tradition of taking a kinsman’s widow as a wife is ancient in Jewish tradition.

Genesis 38:6-11 English Standard Version

6 And Judah took a wife for Er his firstborn, and her name was Tamar. 7 But Er, Judah’s firstborn, was wicked in the sight of the Lord, and the Lord put him to death. 8 Then Judah said to Onan, “Go in to your brother’s wife and perform the duty of a brother-in-law to her, and raise up offspring for your brother.” 9 But Onan knew that the offspring would not be his. So whenever he went in to his brother’s wife he would waste the semen on the ground, so as not to give offspring to his brother. 10 And what he did was wicked in the sight of the Lord, and he put him to death also. 11 Then Judah said to Tamar his daughter-in-law, “Remain a widow in your father’s house, till Shelah my son grows up”—for he feared that he would die, like his brothers. So Tamar went and remained in her father’s house.

We find Tamar in the lineage of Jesus even though Judah’s son had died. Matthew 1:3 and Judah the father of Perez and Zerah by Tamar, and Perez the father of Hezron, and Hezron the father of Ram,

Shelah did not take Tamar to wife, so Tamar played the harlot to Judah after his wife died and tricked him into redeeming her. So strong is this tradition of the Jews that a widow should have a son to care for her in her old age that Jesus gave His mother to John because all her kinsmen would die and she would be left without a son.

John 19:26-27 English Standard Version

26 When Jesus saw his mother and the disciple whom he loved standing nearby, he said to his mother, “Woman, behold, your son!” 27 Then he said to the disciple, “Behold, your mother!” And from that hour the disciple took her to his own home.