Thanks for your question.
Using the ESV [English Standard Version] the word wash/washed/washing occurs 124 times in the Bible. In the Old Testament it often refers to ritual washing which symbolically removes uncleanness which represents sin. For example:
- Exodus 19:10,14 the washing of garments is connected to consecration.
- Exodus 30 talks about the laver in the Tabernacle and it's meaning of spiritual cleansing. See also Psalm 26:6 and especially 51:7; Isaiah 1:16 and Jeremiah 4:14.
- Jesus takes up this theme of consecration to God's service by ritual washing in John 13:5-14 - we are washed clean by Jesus as the priests were in the service of the Tabernacle and Temple.
- We have a responsibility to help one another to be cleansed of the filth of the flesh. See Acts 22:16; 1 Corinthians 6:11; Ephesians 5:26; Titus 3:5; Hebrews 10:22; 2 Peter 2:22; Revelation 7:14; 22:14. Peter refers to the washing of Baptism in 1 Peter 3:21.