First "generation" beast of man:
Matthew 15:18-20
18
But those things which proceed out of the mouth come forth from the heart; and they defile the man.
19 For
out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies:
20
These are the things which defile a man: but to eat with unwashed hands defiles not a man.
Thus the heart of the man is first given over to the beast of a lion. And when the heart of the man is given over to a lion the man becomes a lion-like man, (full of pride), and begins to speak with the mouth of a lion; for those things which proceed out of the mouth come forth from the heart in the Testimony-Doctrine of Yeshua:
Daniel 4:16-17
16
Let his heart be changed from that of a man,
and let the heart of a beast be given unto him; and let seven times pass|over him.
17 This matter is by the decree of the Watchers, and the demand by the Memra-Word of the holy ones: to the intent that the living may know that the Most High rules in the dominion of men, and gives it to whomsoever He will, and sets up over it the humblest of men.
Daniel 7:4
4
The first was like a lion, and had eagle's wings: I beheld till the wings thereof were plucked, and it was lifted up from the land, and made stand upon the feet as a man,
and the heart of a man was given to it.
So the composite beast of a man in the Apocalypse speaks with the mouth of a lion because his heart is given over to the beast of a lion. What comes forth from his mouth are blasphemies against the Elohim of the heavens and those tabernacle-tenting in the heavens:
Revelation 13:2
2 And the beast which I saw was like unto a leopard, and his feet were as the feet of a bear,
and his mouth as the mouth of a lion:and the dragon gave him his power, and his seat, and great authority.
Revelation 13:6
6 And he opened his mouth in blasphemy against the Elohim, to blaspheme His name, and His tabernacle, and those tabernacle-tenting in the heavens.
Yeshua Says, Happy is the lion whom the man will eat because the lion will become that man: defiled is the man whom the lion will eat because the lion still becomes that man! (Thomas #7).