First Bible Reference to the Kingdom?

I was reading I Samuel 2 yesterday, the part where Hannah is rejoicing because she had just given birth to Samuel, and I came across this in verse 10:

“The Lord will judge the ends of the earth;
And He will give strength to His king,
And will exalt the horn of His annointed.”

My first thought was that this was a prophetic reference to King Jesus and and His kingdom, that God would exalt Him above the kings of the earth.  I checked some commentaries and, sure enough, that seems to be the consensus.

Now here’s the question, is this the first reference to King Jesus or His kingdom?  Do you know of any earlier reference?