'Applies' in the Bible

“This is what applies to the Levites: from twenty-five years old and upward they shall enter to perform service in the work of the Tent of Meeting,

“Even the stork in the skyKnows her seasons [of migration],And the turtledove, the swallow and the craneObserve the time of their return.But My people do not knowThe law of the Lord.

And they answered, “Believe in the Lord Jesus [as your personal Savior and entrust yourself to Him] and you will be saved, you and your household [if they also believe].”

That is, it is not the children of the body [Abraham’s natural descendants] who are God’s children, but it is the children of the promise who are counted as [Abraham’s true] descendants.