Tosefta do Samuela I 28:1

As long as Samuel was alive, the Philistines fell under the hand of Israel, as it is said (1 Sam. 7:13), "And the hand of God was against the Philistines as long as Samuel was alive." Once Samuel died, what does it say, but (1 Sam. 25:1), "And died Samuel [and all Israel gathered and mourned him]," and (1 Sam. 28:1), "[It was in those days that] the Philistines gathered their forces to wage war with Israel."
[Relatedly,] in one [place] it is written (1 Sam. 28:3), "And Samuel died [and all Israel mourned him]." And it is [also] written (1 Sam. 25:1), "And died Samuel, etc." Rather, "Samuel died" -- this is his actual death; "And died Samuel" -- this refers to the matter of Saul. Rabbi Eliezer says, behold, it says (1 Sam. 28:14, in the encounter of King Saul and the Witch of Endor), "And [Saul] said to her, 'What is his appearance?' And she said, 'An old man is rising up.'" So that it would not enter your mind that Samuel did not [actually] die; rather, he was [indeed] dead. And it says (1 Sam. 28:3), "And all Israel mourned him, and he was buried in 'Ramah', in his [home] town." And thus, we are not being informed that "Ramah" is his [home] town; rather, it teaches that all Israel mourned him, and that the manner of their mourning was "Ramah" (i.e., exalted).