Albert Barnes' Notes on the Whole Bible - Hebrews 12:24
And to Jesus the Mediator of the new covenant - This was the crowning excellence of the new dispensation in contradistinction from the old. They had been made acquainted with the true Messiah; they were united to him by faith; they had been sprinkled with his blood; see the notes on Hebrews 7:22, and Hebrews 8:6. The highest consideration which can be urged to induce anyone to persevere in a life of piety is the fact that the Son of God has come into the world and died to save sinners; compare... read more
The Pulpit Commentary - Hebrews 12:22-24
But ye are come unto Mount Zion, and unto the city of the living God, the heavenly Jerusalem. Here, as in Galatians 4:1-31 ., Zion and Jerusalem, ideally regarded, are contrasted with Sinai. The foundation of the conception is in the Old Testament. When David at length won the citadel of Zion, and placed the ark upon it, it was a sort of primary and typical fulfillment of the promise of rest, seen afar off by the patriarchs and from the wilderness. Psalms 24:1-10 ., which was sung on... read more