Adam Clarke on Hebrews 8:5

Unto the example and shadow - Υποδειγματι και σκιᾳ, With the representation and shadow; this is Dr. Macknight's translation, and probably the true one.

The whole Levitical service was a representation and shadow of heavenly things; it appears, therefore, absurd to say that the priests served Unto an example or representation of heavenly things; they served rather unto the substance of those things, With appropriate representations and shadows.

As Moses was admonished - Καθως κεχρηματισται Μωσης· As Moses was Divinely warned or admonished of God.

According to the pattern - Κατα τον τυπον· According to the type, plan, or form. It is very likely that God gave a regular plan and specification of the tabernacle and all its parts to Moses; and that from this Divine plan the whole was constructed. See on Exo 25:40 (note).