The first example of personification within the poem is that death stops for the narrator. This indicates that death has the ability to stop and go and get the person. Death is kindly, a quality associated with a person. Death knows no haste, ability to hurry, but death could only know something if he has a brain and can be cognitive of something. Death and the setting sun are presented as "he" and have the ability to pass by one another.
Emily Dickinson's whole poem presents death as a person who has come to get the narrator who is too busy getting on with her life to stop living. Death arrives on its own and picks her up in a carriage but takes he time to take her past things that she enjoys as he takes her to his place.