This segment provides the references to thanksgiving in Revelation. There are three such references. It is interesting to note that in each case the twenty-four elders are involved in giving thanks to God.
In the first passage the elders give the thanks together with glory and honour - they also ascribe power to God. Technically, the four beasts are explicitly described as giving thanks, but it should be clear from the context that the elders are joining in with the beasts. In the second passage the elders give not only thanks, glory, and honour to God but also ascribe wisdom, and power, and might to him. In the third passage the elders give thanks to God for having power and reigning.
These passages should remind us that our thanksgiving should never cease - not only in this life, but in the life to come as well.
And before the throne there was a sea of glass like unto crystal: and in the midst of the throne, and round about the throne, were four beasts full of eyes before and behind. And the first beast was like a lion, and the second beast like a calf, and the third beast had a face as a man, and the fourth beast was like a flying eagle. And the four beasts had each of them six wings about him; and they were full of eyes within: and they rest not day and night, saying, Holy, holy, holy, Lord God Almighty, which was, and is, and is to come.
And when those beasts give glory and honour and thanks to him that sat on the throne, who liveth for ever and ever, the four and twenty elders fall down before him that sat on the throne, and worship him that liveth for ever and ever, and cast their crowns before the throne, saying, Thou art worthy, O Lord, to receive glory and honour and power: for thou hast created all things, and for thy pleasure they are and were created.
After this I beheld, and, lo, a great multitude, which no man could number, of all nations, and kindreds, and people, and tongues, stood before the throne, and before the Lamb, clothed with white robes, and palms in their hands; and cried with a loud voice, saying, Salvation to our God which sitteth upon the throne, and unto the Lamb.
And all the angels stood round about the throne, and about the elders and the four beasts, and fell before the throne on their faces, and worshipped God, saying, Amen: Blessing, and glory, and wisdom, and thanksgiving, and honour, and power, and might, be unto our God for ever and ever. Amen.
And the seventh angel sounded; and there were great voices in heaven, saying, The kingdoms of this world are become the kingdoms of our Lord, and of his Christ; and he shall reign for ever and ever. And the four and twenty elders, which sat before God on their seats, fell upon their faces, and worshipped God, saying, We give thee thanks, O Lord God Almighty, which art, and wast, and art to come; because thou hast taken to thee thy great power, and hast reigned.