What is the meaning of "Ya'asok Nahar"?
'Rashi': The Pras river, its water increases (Bereishis Rabah 16:6). It is a great river. This animal drinks from it, and 'steals' from creations 1 .
Malbim: Now He discusses the other creation that, according to Iyov, should be eradicated - the Livyasan. It is found in the water, and tears all beings there. It wants to steal the river, and all in it!
Ibn Ezra: It is so big, that when it drinks the river water, the lack is seen.
What do we learn from "v'Lo Yachpoz"?
'Rashi': Its stomach does not harden via drinking from the Paras. This is like "Yachpoz Zenavo" (17).
Ibn Ezra: It does not drink b'Chipazon (hastily), for it does not fear Chayos or man.
Malbim: You should [eradicate the Livyasan], lest it quickly steal the river, and all in it!
What do we learn from "Yivtach Ki Yagi'ach Yarden"?
'Rashi': It is confident to draw all the water of the Yarden to its mouth, if it would drink there. Yagi'ach 1 is like "Gochi mi'Baten" - pulling.
Malbim: It trusts that it can bring all water of the Yarden to its mouth, and destroy all living beings in it.
Ibn Ezra: Yagi'ach is leaving, like "Megi'ach mi'Mekomo", "Gochi mi'Baten."
