The OT did not approve of his having that many wives.
Should Christians obey OT laws?
"For freedom Christ has set us free; stand firm therefore, and do not submit again to a yoke of slavery. (Galatians 5:1)
"All things are lawful unto me, but all things are not expedient: all things are lawful for me, but I will not be brought under the power of any." (1 Cor 6:12)
7But not everyone has this knowledge. Some people are still so accustomed to idols that they eat such food as if it were sacrificed to an idol.
And since their conscience is weak, it is defiled. 8 But food does not bring us closer to God: We are no worse if we do not eat, and no better if we do. 9Be careful, however, that your freedom does not become a stumbling block to the weak.…
1 Corinthians 8:9 But take heed lest by any means this liberty of yours become a stumblingblock to them that are weak.
13 Therefore let us stop judging one another. Instead, make up your mind not to put any stumbling block or obstacle in your brother’s way.
Rom. 14:14 I know, and am persuaded by the Lord Jesus, that there is nothing unclean of itself: but to him that esteemeth any thing to be unclean, to him it is unclean.
15If your brother is distressed by what you eat, you are no longer acting in love. Do not by your eating destroy your brother, for whom Christ died.…
Titus 1:15
To the pure, all things are pure; but to the defiled and unbelieving, nothing is pure. Indeed, both their minds and their consciences are defiled.
Gal.5:22 But the fruit of the Spirit is love, joy, peace, forbearance, kindness, goodness, faithfulness, 23 gentleness and self-control. Against such things there is no law.
Galatians 5:18 But if you be led of the Spirit, you are not under the law.