2 Samuel, chapters 1-3

Then David sent messengers to Ishbosheth, Saul’s son, saying: “Give me my wife Michal […] So Ishbosheth sent to take her from her husband, Paltiel the son of Laish. But her husband kept walking with her, weeping as he followed her as far as Bahurim. Then Abʹner said to him: “Go, return!” At that he returned.
~2 Samuel 3:14-16

Never mind that David already had sons from six different women at the time of this event (2 Sam 3:2-5).
After several years of being on the run, David wanted his first wife back- the original one- the princess for whom he risked his life in battle for (1 Sam. 18:27).

It is touching that Michal’s new husband, Paltiel, followed her and wept at her departure.
I find it noteworthy that God’s word should include this emotive detail amidst so many stories of conquest and bloodshed.

The princess Michal was moved from one man to another as if she were an asset, and it did not matter if she originally had been very much in love with David or if Paltiel was now in love with her (1 Sam. 18:20).

What we learn here is that marriage is marriage and David had the legal right over Michal because he married her first.
It was his decision not to divorce her despite the distance between them.

Although modern marriages also undergo certain psychological trauma, we live in a mostly monogamous society in which fidelity is expected both ways and infidelity is conducive to the dissolution of the marriage (Matt. 19:9).

While it is easy for us as readers to follow David’s train of thought, we should also observe that God took note of Paltiel’s reaction.
Jehovah is not a cold-hearted God nor is he indifferent to the feelings of those who are not even serving him.

1 Samuel, chapters 19-22

Michal took the teraphim statue and placed it on the bed, and she put a net of goat hair at the place of [David’s] head, and she covered it with a garment.
~1 Samuel 19:13

Why did David’s wife, Michal, have a teraphim idol if God had forbidden their use (Exo. 20:4,5)?

The Watchtower gives a possible explanation in that her heart may not have been complete toward Jehovah and it is possible that certain superstitions still influenced Israeli culture.

Perhaps David did not know about the idol, but it is also possible that he let her keep it because she was the king’s daughter (Watchtower 06-01-04, p.29, “Questions from Readers”).
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With that the king said to the guards stationed around him: “Turn and kill the priests of Jehovah, because they have sided with David! They knew that he was a runaway, and they did not inform me!” But the king’s servants did not want to lift their hands to assault the priests of Jehovah.
~1 Samuel 22:17

The guards in this story are a fine example of fearing God instead of man (Matt. 10:28).

When human authorities come in direct conflict with God’s will, the right thing to do is to carry out God’s will (Acts 5:29).

This principle alone would avoid modern cases of genocide.