Wash the feet

"If I then, your Lord and Teacher, have washed your feet, you also ought to wash one another’s feet."

John 13: 14

Jesus did not wash His disciples' feet to show humbleness, but to teach them how to behave with one another. The servant does not question, but obey.

Beautiful feet

"How beautiful upon the mountains are the feet of him who brings good news,who proclaims peace, who brings glad tidings of good things, who proclaims salvation..."

Isaiah 52:7

Those who preach salvation are the Apple of God's Eyes. They benefit from all the blessings of the Altar, the Throne of God.

Sandals

Then he said, “Do not come near; take your sandals off your feet, for the place on which you are standing is holy ground.”                                                         
                                                     Exodus 3:5

Why did he have to take his sandals off his feet? Receiving a revelation from God is only possible if you have a humble heart. Moses learnt this when he removed his sandals. From that moment he was chosen to serve. The servant is one who serves with all of his heart to please his Lord.