It's the weighing of the heart ceremony in which the newly deceased's heart is weighed against the feather of Maat (truth)
Starting on the far left, the dead person, perhaps a Pharaoh, is being led by Anubis who is responsible the embalming the dead.
Below the scales is the strange half hippo half crocodile goddess Taweret who protects and facilitates rebirth.
Then there's my favourite Thoth, doing what he does best and transcribing the result that the person's heart did indeed weigh less than the feather. I hope you showed God a pure and light heart too anon.
Now we see horus, God of the Sun, presenting the dead man to Osiris and Isis…otherwise known as Orion and Sirius.
Not sure what the little seated guys up the top are… perhaps they represent the 12 signs of the Zodiac?