Reference: Cheek
Easton
Smiting on the cheek was accounted a grievous injury and insult (Job 16:10; La 3:30; Mic 5:1). The admonition (Lu 6:29), "Unto him that smiteth thee on the one cheek offer also the other," means simply, "Resist not evil" (Mt 5:39; 1Pe 2:19-23). Ps 3:7 = that God had deprived his enemies of the power of doing him injury.
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[The forces of evil] have gaped at me with their mouths; they have struck me upon the cheek insolently; they massed themselves together and conspired unanimously against me.
Arise, O Lord; save me, O my God! For You have struck all my enemies on the cheek; You have broken the teeth of the ungodly.
Let him give his cheek to the One Who smites him [even through His human agents]; let him be filled [full] with [men's] reproach [in meekness].
Now gather yourself in troops, O daughter of troops; a state of siege has been placed against us. They shall smite the ruler of Israel with a rod (a scepter) on the cheek.
But I say to you, Do not resist the evil man [who injures you]; but if anyone strikes you on the right jaw or cheek, turn to him the other one too.
To the one who strikes you on the jaw or cheek, offer the other jaw or cheek also; and from him who takes away your outer garment, do not withhold your undergarment as well.
Hastings
The seat of health and beauty (Song 1:10; 5:13). To be smitten on the cheek was the climax of insult and violence. That the command in Mt 5:39 is not to be interpreted literally is shown by Christ's own protest in Joh 18:23.
C. W. Emmet
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Your cheeks are comely with ornaments, your neck with strings of jewels.
His cheeks are like a bed of spices or balsam, like banks of sweet herbs yielding fragrance. His lips are like bloodred anemones or lilies distilling liquid [sweet-scented] myrrh.
But I say to you, Do not resist the evil man [who injures you]; but if anyone strikes you on the right jaw or cheek, turn to him the other one too.
Jesus replied, If I have said anything wrong [if I have spoken abusively, if there was evil in what I said] tell what was wrong with it. But if I spoke rightly and properly, why do you strike Me?