Answer:
Marcellus
Step-by-step explanation:
Marcellus: Let's follow. 'Tis not fit thus to obey him.
Horatio: Have after! To what issue will this come?
Marcellus: Something is rotten in the state of Denmark.
Horatio: Heaven will direct it.
Marcellus: Nay, let's follow him.
-- Hamlet Act I, Scene IV
In this scene, Hamlet is bid by the ghost of the king to follow him. Marcellus and Horatio, the two guardsmen on duty, attempt to persuade Hamlet not to go, but he persists. The two eventually follow.