King Prthu was born of the dead body of King Vena as fire is produced from arani wood. Thus King Prthu will always remain just like fire, and his enemies will not be able to approach him

Expressions researched:
"King Prthu was born of the dead body of King Vena as fire is produced from arani wood. Thus King Prthu will always remain just like fire, and his enemies will not be able to approach him"

Srimad-Bhagavatam

SB Canto 4

King Prthu was born of the dead body of King Vena as fire is produced from arani wood. Thus King Prthu will always remain just like fire, and his enemies will not be able to approach him.

SB 4.16.11, Translation and Purport

King Pṛthu was born of the dead body of King Vena as fire is produced from araṇi wood. Thus King Pṛthu will always remain just like fire, and his enemies will not be able to approach him. Indeed, he will be unbearable to his enemies, for although staying very near him, they will never be able to approach him but will have to remain as if far away. No one will be able to overcome the strength of King Pṛthu.

Araṇi wood is a kind of fuel used to ignite fire by friction. At the time of performing sacrifices, one can ignite a fire from araṇi wood. Although born of his dead father, King Pṛthu would still remain just like fire. Just as fire is not easily approached, King Pṛthu would be unapproachable by his enemies, even though they would appear to be very near him.