Deuteronomy 25:9

Overview - Deuteronomy 25
Stripes must not exceed forty.
The ox is not to be muzzled.
Of raising seed unto a brother.
11 Of the immodest woman.
13 Of unjust weights and measures.
17 The memory of Amalek is to be blotted out.
Treasury of Scripture Knowledge

Deuteronomy 25:9  (King James Version)
Then shall his brother's wife come unto him in the presence of the elders, and loose his shoe from off his foot, and spit in his face, and shall answer and say, So shall it be done unto that man that will not build up his brother's house.

loose his shoe
Pulling off the shoe seems to express his being degraded to the situation of slaves, who generally went barefoot; and spitting in or rather before, (biphney) his face, was a mark of the utmost ignominy.
Ruth 4:7 Ruth 4:8 ; Isaiah 20:2 ; Mark 1:7 ; John 1:27

Numbers 12:14 ; Job 30:10 ; Isaiah 50:6 ; Matthew 26:67 ; 27:30 Mark 10:34

So shall
Genesis 38:8-10 ; Ruth 4:10 Ruth 4:11 ; 1 Samuel 2:30