Continue with the context.
20 And they went forth, and preached every where, the Lord working with them, and confirming the word with signs following. Amen.
The purpose of those signs were to confirm the word that they proclaimed was from God. We don't need them anymore because the word has been confirmed...
All you have done is proven once more that you do not know how to study these things out properly.
Leaving you at what you just now did with the above - you read your own interpretation into what was meant in that passage.
Mark 16:17 And these signs shall follow them that believe; In my name shall they cast out devils; they shall speak with new tongues; 16:18 They shall take up serpents; and if they drink any deadly thing, it shall not hurt them; they shall lay hands on the sick, and they shall recover. 16:19 So then after the Lord had spoken unto them, he was received up into heaven, and sat on the right hand of God. 16:20 And they went forth, and preached every where, the Lord working with them, and confirming the word with signs following. Amen.
In the above, verse 20's "confirming the word with signs following" refers to those signs having been evidence that what they were preaching was from God.
That is what "the word" there is referring to - to preaching Him.
Mark 16:17 And these signs shall follow them that believe; IN MY NAME shall they cast out devils; they shall speak with new tongues;
Acts 3:6 Then Peter said, Silver and gold have I none; but such as I have give I thee: IN THE NANE OF Jesus Christ of Nazareth rise up and walk. 3:7 And he took him by the right hand, and lifted him up: and immediately his feet and ankle bones received strength.
Preaching Him to whom?
No sense in bothering - for you adamantly go against the witness of Early Acts as to who it repeatedly says they were preaching to.
So never mind who the writer OF HEBREWS also mentions who said preaching had been confirmed by signs and wonders to...
Hebrews 2:3 How shall we escape, if we neglect so great salvation; which at the first began to be spoken by the Lord, and was confirmed unto us by them that heard him; 2:4 God also bearing them witness, both with signs and wonders, and with divers miracles, and gifts of the Holy Ghost, according to his own will? 2:5 For unto the angels hath he not put in subjection the world to come, whereof we speak.
Why?
"For the Jews require a sign,"1 Corinthians 1:22a.
Romans 5:6-8 towards ya, Turbo.