The book of Hebrews contains warnings to its readers in Hebrews 2, 4, 6, 10 and 12. It is extremely easy to miss the point of the warnings by taking from them meaning that doesn't belong if people fail to comprehend the background and context of the situation. I don't have time or space to go over each chapter and every verse. Suffice it to say that Hebrews opens with the writer expressing the fact that Jesus is supreme and His supremacy is over all things and all religious systems, including the Mosaic sacrificial system. This point is brought out in various ways throughout Hebrews and we need to take note of it.