'O God' in the Bible

Long ago God spoke to the fathers by the prophets at different times and in different ways.

but to the Son:Your throne, God,is forever and ever,and the scepter of Your kingdomis a scepter of justice.

Therefore, He had to be like His brothers in every way, so that He could become a merciful and faithful high priest in service to God, to make propitiation for the sins of the people.

For every high priest taken from men is appointed in service to God for the people, to offer both gifts and sacrifices for sins.

(for the law perfected nothing), but a better hope is introduced, through which we draw near to God.

Therefore, He is always able to save those who come to God through Him, since He always lives to intercede for them.

how much more will the blood of the Messiah, who through the eternal Spirit offered Himself without blemish to God, cleanse our consciences from dead works to serve the living God?

Then I said, “See—it is written about Mein the volume of the scroll—I have come to do Your will, God!”

By faith Abel offered to God a better sacrifice than Cain did. By faith he was approved as a righteous man, because God approved his gifts, and even though he is dead, he still speaks through his faith.

to the assembly of the firstborn whose names have been written in heaven, to God who is the Judge of all, to the spirits of righteous people made perfect,

Therefore, through Him let us continually offer up to God a sacrifice of praise, that is, the fruit of our lips that confess His name.