Pray for forgiveness on behalf of those who have passed away.

This hadith is about the importance of praying for forgiveness of those who have passed away. It was narrated by Abu Hurairah that when An-Najashi died, the Prophet Muhammad asked people to pray for forgiveness on his behalf. This shows us how important it is to remember and pray for those who have passed away, as they are no longer able to do so themselves. Praying for them can be a way of showing mercy and compassion towards them, as well as seeking God's mercy and blessings upon them in their afterlife. It also teaches us that we should always strive to forgive others even after they have gone, as this will help us in our own spiritual journey towards God's mercy and grace.