'Seething' in the Bible

And the priests' custom with the people was, that, when any man offered sacrifice, the priest's servant came, while the flesh was in seething, with a fleshhook of three teeth in his hand;

“I am seething within and cannot relax;Days of affliction confront me.

Out of his nostrils goeth smoke, as out of a seething pot or caldron.

And the word of the LORD came unto me the second time, saying, What seest thou? And I said, I see a seething pot; and the face thereof is toward the north.