Is it considered an injustice to the second wife when a polygamous husband travels with his first wife to visit his family, leaving the second wife behind under the pretext of her pregnancy, and then fails to compensate her for the days he was absent after she gave birth and seven months have passed, and then repeats his travel with the first wife to attend his daughter's wedding, despite the second wife's desire to celebrate her newborn with his family and her disapproval of this behavior?

Allah Almighty commanded justice between wives and forbade leaning towards one of them. So, whoever has two wives and leans towards one, will come on the Day of Resurrection with his side leaning. The husband must be just between his wives in everything he is capable of, and this includes travel. That is why the Prophet, peace and blessings be upon him, would cast lots among his wives when he intended to travel. Designating one wife for travel without casting lots or obtaining permission from the other is a prohibited leaning and a deprivation of her right to spend the night and her share. The husband must compensate for the days he traveled with the other wife.