What is the biblical meaning of purity?

Answer 1

Jewish answer: the usual form of purification (Leviticus ch.15,16 and elsewhere) is immersion in a mikveh (ritual bath). Sometimes it's obligatory, and sometimes it's required only for those wishing to enter the Temple grounds (Talmud, Yoma 30a) or eat from the shelamim-offerings.

Answer 2

Baptism means 2 things; Acceptance into the Christian religion (normally done by your relatives after you are born) and to wash away your 'sins'. Baptism can be another way to be 'reborn' with a new look on life.

Answer 3

In the New Testament, "purity" is translated from the Greek word hagnotes, which means "purity, chastity, uprightness of life," according to Strong's (#54).