Hebrews 2:3-4

NLT: 3What makes us think that we can escape if we are indifferent to this great salvation that was announced by the Lord Jesus himself? It was passed on to us by those who heard him speak, 4and God verified the message by signs and wonders and various miracles and by giving gifts of the Holy Spirit whenever he chose to do so.

NIV: 3how shall we escape if we ignore such a great salvation? This salvation, which was first announced by the Lord, was confirmed to us by those who heard him. 4God also testified to it by signs, wonders and various miracles, and gifts of the Holy Spirit distributed according to his will.

NASB: 3how will we escape if we neglect so great a salvation? After it was at the first spoken through the Lord, it was confirmed to us by those who heard, 4God also testifying with them, both by signs and wonders and by various miracles and by gifts of the Holy Spirit according to His own will.

KJV: 3How 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; 4God also bearing them witness, both with signs and wonders, and with divers miracles, and gifts of the Holy Ghost, according to his own will?

Comment: The author reminds his audience that the message concerning Jesus' death and resurrection was accompanied by various supernatural signs [cf. Mark 16:20]. Apparently they had personally witnessed these miracles from those who preached the message of salvation through Jesus. Otherwise, why would the author be reminding his audience of things they weren't familiar with as the basis for an exhortation to remain faithful? As the author points out, supernatural signs accompanying the message would certainly be compelling evidence for the truth of that message.