'Pure' in the Bible

"Command the Israelites to bring to you pure oil of beaten olives for the light, to make a lamp burn continually.

On the ceremonially pure lampstand he must arrange the lamps before the Lord continually.

and you must set them in two rows, six in a row, on the ceremonially pure table before the Lord.

You must put pure frankincense on each row, and it will become a memorial portion for the bread, a gift to the Lord.