Hisgalus 5:6-8

And I saw between the Kes (Throne) and the Arbah Chayyot (four living beings) and among the Zekenim (Elders) a SEH (Lamb), having stood as having been slain, having sheva karnayim (horns), sheva eynayim (eyes), which are the sheva ruchot (spirits) of HASHEM having been sent into kol ha'aretz (all the earth). And the SEH (Lamb) came and has taken the sefer out of the yamin (right hand) of the One sitting on the Kes (Throne). And when the SEH received the sefer, the Arbah Chayyot (four living beings) and the esrim v'arba'ah Zekenim (twenty-four Elders) fell down before the SEH (Lamb), each one having a nevel (harp) and golden ke'arot (bowls) full of ketoret (incense), which are the tefillos (prayers) of the Kedoshim.