Hebrews 10:22 (ESV) … “let us draw near with a true heart in full assurance of faith, with our hearts sprinkled clean from an evil conscience and our bodies washed with pure water.”
When we become a Christians, we must prepare ourselves spiritually to fellowship with God. The Old Testament priest had to go through various washings and the applying of blood on the Day of Atonement (Lev. 16). Also, during the regular daily ministry, the priests had to wash at the laver before they entered the holy place (Ex. 30:18–21). This is not the case for us today.
Because of Jesus we have direct access to the throne of God. As New Testament Christians, we must come to God with a pure heart and a clean conscience. Fellowship with God demands purity. The new covenant (cf. Jer. 31:31–34) is a new heart and a new spirit; an internal love and an external law; a free gift in the finished work of Christ, but it also has requirements, expected fruit, observable consequences! Confidence of salvation issues in godly living! It is not primarily a creed to affirm, nor a theology to embrace, but a Christlikeness (not sinlessness) which is evident to all!