It is significant that the Greek word for “taste” in Hebrews 6 is the same word used of Jesus when He tasted death. The Greek word translated “taste” implies a brief acquaintance with, or something that is temporary. This would certainly agree with the Lord’s experience. Death had no dominion over Christ. It was only temporary. So was the experience of those in Hebrews:6:4–6. They were tasters; they never fully ingested Christ in their lives.
"For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Ghost, And have tasted the good word of God, and the powers of the world to come, If they shall fall away, to renew them again unto repentance."