'Pure' in the Bible

These are the ones who have not been defiled [by relations] with women, for they are celibate. These are the ones who follow the Lamb wherever He goes. These have been purchased and redeemed from among men [of Israel] as the first fruits [sanctified and set apart for special service] for God and the Lamb.

and the seven angels who had the seven plagues (afflictions, calamities) came out of the temple, arrayed in linen, pure and gleaming, and wrapped around their chests were golden sashes.

The wall was built of jasper; and the city was pure gold, transparent like clear crystal.

And the twelve gates were twelve pearls; each separate gate was of one single pearl. And the street (broad way) of the city was pure gold, like transparent crystal.