2 Kings 9:20

And the watchman told, saying, He came even unto them, and cometh not again: and the driving is like the driving of Jehu the son of Nimshi; for he driveth furiously.

Cross-references

2 Kings 10:16 shows Jehu's zeal for the LORD—his furious driving here is the visible expression of that zeal.

2 Samuel 18:27 has a watchman identifying a messenger by his running—here the watchman identifies Jehu by his furious driving style.