Who is worshipped in heaven?

Revelation 5:13 NWT

And I heard every creature in heaven and on earth and underneath the earth and on the sea, and all the things in them, saying: “To the One sitting on the throne and to the Lamb be the blessing and the honor and the glory and the might forever and ever.

Who is every creature giving glory to?
Revelation 5:14 NWT

The four living creatures were saying: “Amen!” and the elders fell down and worshipped.

Who did the elders fall down and worship?