Note Hebrews 6 pertains to principles taught by Christ. (Heb. 6:1)Well, before I change my stance, since I may agree with you, consider..
Hebrews 10:17-22 KJV
And their sins and iniquities will I remember no more. [18] Now where remission of these is, there is no more offering for sin. [19] Having therefore, brethren, boldness to enter into the holiest by the blood of Jesus, [20] By a new and living way, which he hath consecrated for us, through the veil, that is to say, his flesh; [21] And having an high priest over the house of God; [22] Let us draw near with a true heart in full assurance of faith, having our hearts sprinkled from an evil conscience, and our bodies washed with pure water.
Offering for sin here.. is animal sacrifice
Repentance (Luke 13:3)
Faith (Mark 16:15-16)
Baptisms (Matt. 28:18-20, Mark 16:16, John 3:5, Luke 11:13)
Laying on of hands (Mark 10:13-16, 16:18; Acts 8:17-18, 19:6)
Resurrection of the dead (John 6:40, 11:25-26)
Eternal judgment (Matt. 25:46)
Lastly, after telling shocked believers that He never knew them Jesus provided insight as to the cause.
Matt 7:21-28
"Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works?
And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.
Therefore whosoever heareth these sayings of mine, and doeth them, I will liken him unto a wise man, which built his house upon a rock:
And the rain descended, and the floods came, and the winds blew, and beat upon that house; and it fell not: for it was founded upon a rock.
And every one that heareth these sayings of mine, and doeth them not, shall be likened unto a foolish man, which built his house upon the sand:
And the rain descended, and the floods came, and the winds blew, and beat upon that house; and it fell: and great was the fall of it.
And it came to pass, when Jesus had ended these sayings, the people were astonished at his doctrine:"
The NT command pertains to all who believe in Jesus. Repent, and be baptized everyone of you in the name of Jesus for remission of sin and receive the Holy Ghost. (Acts 2:36-42, 8:12-18, 10:43:49, 19:1-7...)