Mark 1:34

Devils [δ α ι μ ο ν ι α]. Demons it should be translated always. Suffered not [ο υ κ ε φ ι ε ν]. Would not allow, imperfect tense of continued refusal. The reason given is "because they knew him" [η ο τ ι ε ι δ ε ι σ α ν α υ τ ο ν]. Whether "to be Christ" [χ ρ ι σ τ ο ν ε ι ν α ι] is genuine or not, that is the meaning and is a direct reference to 1:24 when in the synagogue the demon recognized and addressed Jesus as the Holy One of God. Testimony from such a source was not calculated to help the cause of Christ with the people. He had told the other demon to be silent. See on ?Matthew 8:29 for discussion of the word demon.