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. 13:1-14:57), and of the house defiled by leprosy (14:49-53; see also Mt. 8:2-4). Uncleanness from touching a dead body (Num. 19:11; Hos. 9:4; Hag. 2:13; Mt. 23:27; Lk. 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 (Dt. 21:6; Mt. 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.