 Music critic Richie Unterberger describes "Testify" as "a delightful track, one that worked as a both an out-and-out raver and a novelty", praising it as "tremendously exciting uptempo soul music".Jimi Hendrix provided the guitar parts, which Unterberger identifies as one of the best examples of his pre-Experience recordings.The practice of "testifying" is used in churches in the American South to express belief in Christian faith and experiences.