There are four things on earth that are small, but they are exceedingly wise:

"If a man steals an ox or a sheep and kills it or sells it, he must pay back five head of cattle for the ox, and four sheep for the one sheep.

Then four large beasts came up from the sea; they were different from one another.

These large beasts, which are four in number, represent four kings who will arise from the earth.

In the fire were what looked like four living beings. In their appearance they had human form, but each had four faces and four wings. Their legs were straight, but the soles of their feet were like calves' feet. They gleamed like polished bronze.read more.
They had human hands under their wings on their four sides. As for the faces and wings of the four of them, their wings touched each other; they did not turn as they moved, but went straight ahead. Their faces had this appearance: Each of the four had the face of a man, with the face of a lion on the right, the face of an ox on the left and also the face of an eagle. Their wings were spread out above them; each had two wings touching the wings of one of the other beings on either side and two wings covering their bodies. Each moved straight ahead -- wherever the spirit would go, they would go, without turning as they went. In the middle of the living beings was something like burning coals of fire or like torches. It moved back and forth among the living beings. It was bright, and lightning was flashing out of the fire. The living beings moved backward and forward as quickly as flashes of lightning. Then I looked, and I saw one wheel on the ground beside each of the four beings. The appearance of the wheels and their construction was like gleaming jasper, and all four wheels looked alike. Their structure was like a wheel within a wheel. When they moved they would go in any of the four directions they faced without turning as they moved. Their rims were high and awesome, and the rims of all four wheels were full of eyes all around.

and in front of the throne was something like a sea of glass, like crystal. In the middle of the throne and around the throne were four living creatures full of eyes in front and in back.

Each one of the four living creatures had six wings and was full of eyes all around and inside. They never rest day or night, saying: "Holy Holy Holy is the Lord God, the All-Powerful, Who was and who is, and who is still to come!"

Then I saw standing in the middle of the throne and of the four living creatures, and in the middle of the elders, a Lamb that appeared to have been killed. He had seven horns and seven eyes, which are the seven spirits of God sent out into all the earth.

and when he had taken the scroll, the four living creatures and the twenty-four elders threw themselves to the ground before the Lamb. Each of them had a harp and golden bowls full of incense (which are the prayers of the saints).

I looked on when the Lamb opened one of the seven seals, and I heard one of the four living creatures saying with a thunderous voice, "Come!"

Then I heard something like a voice from among the four living creatures saying, "A quart of wheat will cost a day's pay and three quarts of barley will cost a day's pay. But do not damage the olive oil and the wine!"

and they were singing a new song before the throne and before the four living creatures and the elders. No one was able to learn the song except the one hundred and forty-four thousand who had been redeemed from the earth.

Then one of the four living creatures gave the seven angels seven golden bowls filled with the wrath of God who lives forever and ever,

The twenty-four elders and the four living creatures threw themselves to the ground and worshiped God, who was seated on the throne, saying: "Amen! Hallelujah!"