Purification

the process by which a person unclean, according to the
Levitical law, and thereby cut off from the sanctuary and the
festivals, was restored to the enjoyment of all these
privileges.

The great annual purification of the people was on the Day of
Atonement (q.v.).

But in the details of daily life there were special causes of
cermonial uncleanness which were severally provided for by
ceremonial laws enacted for each separate case. For example, the
case of the leper (Lev. 13, 14), and of the house defiled by
leprosy (14:49-53; see also Matt. 8:2-4). Uncleanness from
touching a dead body (Num. 19:11; Hos. 9:4; Hag. 2:13; Matt.
23:27; Luke 11:44). The case of the high priest and of the
Nazarite (Lev. 21:1-4, 10, 11; Num. 6:6, 7; Ezek. 44:25).
Purification was effected by bathing and washing the clothes
(Lev. 14:8, 9); by washing the hands (Deut. 21:6; Matt. 27:24);
washing the hands and feet (Ex. 30:18-21; Heb. 6:2, "baptisms",
R.V. marg., "washings;" 9:10); sprinkling with blood and water
(Ex. 24:5-8; Heb. 9:19), etc. Allusions to this rite are found
in Ps. 26:6; 51:7; Ezek. 36:25; Heb. 10:22.