Amen! They drew back to perdition and did not believe to the saving of the soul. (Hebrews 10:39)
Verse 26 also has another thing that might of escaped our notice. The writer through the Holy Spirit includes himself in the admonition.
Heb 10:26 For if WE sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins,
As he continues in this admonition, verse 29 states they, those who sinned willfuly after receiving the knowledge of the truth. These people were sanctified but if they sinned willfuly they counted the blood of the covenant an unholy thing and done despite unto the Spirit of Grace.
Heb 10:29 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?
Then the writer through the Holy Spirit continues to speak to these who are sanctified and confirms that they have been illuminated
Heb 10:32 But call to remembrance the former days, in which, after ye were illuminated, ye endured a great fight of afflictions;
Then in verse 35 the writer exhorts these illuminated that are sanctified not to cast away their confidence.
Heb 10:35 Cast not away therefore your confidence, which hath great recompence of reward.
Then the writer admonishes them that they must not draw back. They can't draw back if they were not a place to draw back from in the first.
Heb 10:38 Now the just shall live by faith: but if any man draw back, my soul shall have no pleasure in him.
Then exhorts them and himself by saying we are not them who draw back but them who believe to the saving of the soul.
Heb 10:39 But we are not of them who draw back unto perdition; but of them that believe to the saving of the soul.