KJV : And <1161> devils <1140> also <2532> came <1831> (5711) out of <575> many <4183>, crying out <2896> (5723), and <2532> saying <3004> (5723), <3754> Thou <4771> art <1488> (5748) Christ <5547> the Son <5207> of God <2316>. And <2532> he rebuking <2008> (5723) [them] suffered <1439> (5707) them <846> not <3756> to speak <2980> (5721): for <3754> they knew <1492> (5715) that he <846> was <1511> (5750) Christ <5547>. {to speak...: or, to say that they knew him to be Christ}

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NASB : Demons also were coming out of many, shouting, "You are the Son of God!" But rebuking them, He would not allow them to speak, because they knew Him to be the Christ.

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NASB# : Demons<1140> also<2532> were coming<1831> out of many<4183>, shouting<2905>, "You are the Son<5207> of God<2316>!" But rebuking<2008> them, He would not allow<1439> them to speak<2980>, because<3754> they knew<3609> Him to be the Christ<5547>.