The Lion and the Lamb are descriptions of two aspects of YAHUSHA’ nature.
He is both the conquering Lion of the tribe of Yahudah and the Lamb who was slain.
“And one of the elders saith unto me, Weep not: behold, the Lion of the tribe of Yahudah , the Root of David, hath prevailed to open the book, and to loose the seven seals thereof.”
CHIZAYON (Revelation) 5:5
The next day Yochanon sees YAHUSHA coming unto him, and says, Behold the Lamb of YAHUAH, which takes away the sin of the world.
YOCHANON (JOHN) 1:29