John Gill Commentary 2 Kings 6:31

"Then he said, God do so to me, and more also, if the head of Elisha the son of Shaphat shall stand on him this day." — 2 Kings 6:31 (ASV)

Then he said, God do so and more also to me
He swore and made dreadful imprecations:

if the head of Elisha the son of Shaphat shall stand on him this day ;
imputing the sore famine to him, because he had foretold it, and did not pray for the removal of it, as he might; and perhaps had advised and encouraged the king to hold out the siege, which had brought them to this extremity, and therefore was enraged at him.