Respectfully remember those who have passed away by praying for their forgiveness and mercy instead of excessively mourning them through practices like wailing .

This hadith is about how people should not wail over the dead, as it will lead to punishment in the grave. It is narrated by Umar ibn al-Khattāb, who was one of Prophet Muhammad's closest companions and a caliph of Islam. He reported that Prophet Muhammad said that those who are wailed over after their death will be punished in their graves for it. This means that they will suffer some kind of pain or discomfort due to this act of mourning. It is important to remember that this punishment does not come from Allah, but rather from other sources such as angels or other spiritual beings. Therefore, it is best to avoid wailing and instead focus on remembering Allah and praying for the deceased's forgiveness and mercy.