Main message: The meaning of foot washing sacrament.

Bible references:

• V1. "pure" (Matthew 5:8)

"humble" (Matthew 11:29)

"to wash me clean and whole" (John 18:10)

"have a part with Him" (John 13:8)

• V2. "stains...made clean" (Philippians 2:15)

• V3. "walk in sin no more" (Isaiah 55:7)

• V4. "spotless" (2 Peter 3:14)

"live in me" (Galatians 2:20)

Keywords: Savior, pure, humble, clean, whole, free, have a part with Him, sin no more, spotless, live in me

Interpretation notes:

• The hymn uses a gentle, rising-and-falling melody set to a repeating rhythmic pattern: a half note, two quarter notes, and a half note. 

• The second and fourth systems vary this pattern by replacing the first half note with two quarter notes. 

• The straightforward melody and rhythm support the text about purity and the solemn sacrament.