He arose and went into the house That is, into an inner chamber in the house. And he poured the oil on his head Thereby giving him, in God's name both a right to the kingdom and the actual possession of it. The Israelites, it must be observed, were still by right and profession the people of God, though they worshipped other gods with him. And it belonged to him to appoint what ruler he pleased over them; which he now did by his prophet. Without this authority, if Jehu had taken the government upon him, he had been a usurper.
Related Commentaries of 2 Kings 9:6
2 Kings 9:6
6 And he arose, and went into the house; and he poured the oil on his head, and said unto him, Thus saith the LORD God of Israel, I have anointed thee king over the people of the LORD, even over Israel.