2 occurrences in 2 dictionaries
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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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