KJV
And when he came to Samaria, he slew all
that remained unto Ahab in Samaria, till he had destroyed him, according to
the saying of the LORD, which he spake to Elijah.
BSB
When Jehu came to Samaria, he struck down everyone belonging to Ahab who remained there, until he had destroyed them, according to the word that the LORD had spoken to Elijah.