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.
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“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