OK Grandpa. Use this forum, with step by step scriptures to show how you come to that conclusion for Hebrews 10 (don't insert supposition). Just use the scriptures as they are. Go as far back in Hebrews as you wish. Looking for the conclusive link.
Don't use your techniques? Imagination and supposition?
Hebrews 10:1-4
1 For the law having a shadow of good things to come, and not the very image of the things, can never with those sacrifices which they offered year by year continually make the comers thereunto perfect.
2 For then would they not have ceased to be offered?
because that the worshippers once purged should have had no more conscience of sins.
3 But in those sacrifices
there is a remembrance again made of sins every year.
4 For
it is not possible that the blood of bulls and of goats should take away sins.
Sacrificing bulls and goats didn't take away sins. It didn't purge the conscience from sin. Those who were sacrificing these bulls and goats were using them as an appeasement to God and not as a way to purge their conscience from sin.
Hebrews 10:26-29
26 For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins,
27 But a certain fearful looking for of judgment and fiery indignation, which shall devour the adversaries.
28
He that despised Moses' law died without mercy under two or three witnesses:
29 Of how much sorer punishment, suppose ye, shall he be thought worthy, who hath trodden under foot the Son of God, and hath counted the blood of the covenant, wherewith he was sanctified, an unholy thing, and hath done despite unto the Spirit of grace?
Verse 28 shows you that Moses Law is still what is being discussed and compared.
You can't just sacrifice Christ next Saturday and be good. Christs sacrifice doesn't work the same way they were using animal sacrifice.
How much worse would the punishment be if someone were to use Christs Sacrifice for a way to be Super Sinful? Because Christs Sacrifice is not designed to be used in such a fashion.
Someone who is saved knows this.
Only someone who is familiar with the animal sacrifice system would probably even think to use Christ in a manner that is unholy and does "despite" to the Spirit of Grace.