Exodus 40:32
When they went into the tent of the congregation, and when they came near unto the altar, they washed; as the Lord commanded Moses.
Cross-reference
Exodus 30:19
Citation
Exodus 30:19 is the command to wash hands and feet, directly referenced by this verse's fulfillment.
Exodus 30:20
Citation
Exodus 30:20 gives the command with the warning 'that they die not', explaining the necessity of this washing.