Strive for fairness and equality in marriage relationships regardless of how many people you are married to at once .

The hadith is about the fairness and equality that the Prophet Muhammad PBUH showed to all of his wives when he married Umm Salamah. He stayed with her for three nights but offered to stay with her for seven nights if she wished it so that he could also stay with each of his other wives for seven nights as well. This shows us that even though the Prophet PBUH was married to multiple women at once, he still treated them all equally without showing any favoritism or bias towards one wife over another. This teaches us an important lesson about marriage - that we should always strive to be fair and equal in our relationships with our spouses regardless of how many people we are married to at once.