Commentaries:
Jesus teaches self-denial to His disciples not only with His words but also by His actions. Notice that His call to self-denial comes immediately after predicting His own sacrificial death. He is the supreme model of the self-denial to which He calls others. He even denies Himself any urge to avenge Himself or to threaten His persecutors for what they had done to Him. In Jesus' example, we see that, by committing ourselves to God who judges rightly, we deny ourselves the temptation of worldly lusts.
Martin G. Collins
Overcoming (Part 5): Self-Denial
The footwashing a commanded ceremony for Christians. It is an object lesson whose meaning we are to inculcate into our lives and practice at every opportunity! As Christ served us, so should we serve others. The apostle John writes in I John 2:6, "He who says he abides in Him ought himself also to walk just as He walked."
Richard T. Ritenbaugh
Footwashing
Because of their incessant bickering about who would be the greatest in the Kingdom (Luke 22:24-27), Jesus gave the disciples an object lesson designed to show them what their real position was under Him. He tells them, "He who is greatest among you, let him be as the younger, and he who governs as he who serves" (verse 26). He shows them that they must be willing to do whatever task—even the most menial—that is necessary for the good of their brothers. This should have put them in the proper attitude for the Passover's greater purpose, Christ's sacrifice for our forgiveness and redemption.
Richard T. Ritenbaugh
Footwashing
Other Forerunner Commentary entries containing John 13:12:
Exodus 12:8
Leviticus 23:5
1 Corinthians 11:23-25
Hebrews 9:19-26
1 Peter 5:5