The author of Hebrews was writing to people familiar with his subject matter.
God, who at sundry times and in divers manners spake in time past unto the fathers by the prophets, (Hebrews 1:1 KJV)
Jews would be familiar with the prophets and their writings. Here is an introduction to this portion of God’s message.
Hath in these last days spoken unto us by his Son, whom he hath appointed heir of all things, by whom also he made the worlds; Who being the brightness of his glory, and the express image of his person, and upholding all things by the word of his power, when he had by himself purged our sins, sat down on the right hand of the Majesty on high; (Hebrews 1:2-3 KJV)
My favorite verses in this book begin the second chapter:
Therefore we ought to give the more earnest heed to the things which we have heard, lest at any time we should let them slip. For if the word spoken by angels was stedfast, and every transgression and disobedience received a just recompence of reward; How 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; (Hebrews 2:1-3 KJV)
Neglect. Such a benign word. Not as hard as “reject” or as final as “deny.” Neglect could be applied to a garden we left for a short time and will return to weed and clean. One we committed to see tended to, blooming and fruitful in due course, but our attention was given elsewhere and it was neglected.
We should give close heed to the things we have heard. Everyone reading this has heard the gospel. It is impossible to say, “I haven’t heard.” There will be no excuse of, “I didn’t know.” Some will say, “I studied it and found it to be untrue.” Be certain that the study is deep and the answers sought.
Jesus Christ the same yesterday, and to day, and for ever. (Hebrews 13:8 KJV)
The Messiah’s coming was promised in the Old Testament and fulfilled in the New. The covenant is everlasting.
Now the God of peace, that brought again from the dead our Lord Jesus, that great shepherd of the sheep, through the blood of the everlasting covenant, (Hebrews 13:20 KJV)
Our ‘job description’ as followers is laid out before us.
Make you perfect in every good work to do his will, working in you that which is wellpleasing in his sight, through Jesus Christ; to whom be glory for ever and ever. Amen. (Hebrews 13:21 KJV)
Seek God's will, that it might be accomplished.