2 Samuel 2:4, 7

And the men of Judah came, and there they anointed David king over the house of Judah. And they told David, saying, The men of Jabesh-gilead were they that buried Saul.

Now therefore let your hands be strong, and be ye valiant; for Saul your lord is dead, and also the house of Judah have anointed me king over them.