The book of Hebrews was written to Hebrews. We need to understand it in that light.
Following the display of Pentecost, many Hebrews believed or professed to do so. In the light of that, the writer says in Hebrews 10, “Recall the former days” — for now a number of years had passed since that time — “when, after you were enlightened, you endured a hard struggle with sufferings, sometimes being publicly exposed to reproach and affliction, and sometimes being partners with those so treated. For you had compassion on those in prison, and you joyfully accepted the plundering of your property, since you knew that you yourselves had a better possession and an abiding one.”
These Hebrews had suffered a great deal.