Luke 1:72-73

to show mercy to our forefathers, and carry out His sacred covenant,

Hebrews 6:16-18

For it is a custom among men to take oath by something greater than themselves, and an oath taken for confirmation settles any dispute among them.

Hebrews 7:26

For we needed such a High Priest, holy, innocent, unstained, far removed from sinful men, and elevated far above the very heavens,

Hebrews 10:21

and since in Him we have a Great Priest over the house of God,

Hebrews 13:15

So then, through Christ, let us always offer God the sacrifice of praise; that is, the speech of lips that glorify the name of God.

1 Peter 2:5

and keep on building yourselves up, as living stones, into a spiritual house for a consecrated priesthood, to offer up, through Jesus Christ, spiritual sacrifices that will be acceptable to God.

Treasury of Scripture Knowledge

Summary

And thou shalt go unto the priest that shall be in those days, and say unto him, I profess this day unto the LORD thy God, that I am come unto the country which the LORD sware unto our fathers for to give us.

Bible References

The priest

Hebrews 7:26
For we needed such a High Priest, holy, innocent, unstained, far removed from sinful men, and elevated far above the very heavens,
Hebrews 10:21
and since in Him we have a Great Priest over the house of God,
Hebrews 13:15
So then, through Christ, let us always offer God the sacrifice of praise; that is, the speech of lips that glorify the name of God.
1 Peter 2:5
and keep on building yourselves up, as living stones, into a spiritual house for a consecrated priesthood, to offer up, through Jesus Christ, spiritual sacrifices that will be acceptable to God.

Which the

Luke 1:72
to show mercy to our forefathers, and carry out His sacred covenant,
Hebrews 6:16
For it is a custom among men to take oath by something greater than themselves, and an oath taken for confirmation settles any dispute among them.