Musar for Sanhedrin 116:12
כי אתא רב דימי אמר ר' אלעזר אמר ר' חנינא בן נח שייחד שפחה לעבדו ובא עליה נהרג עליה
R. Huna said: A heathen may marry his daughter. But should you ask, If so, why did not Adam marry his daughter? — In order that Cain might marry his sister, that the world might be built up by grace. Others give this version: R. Huna said: A heathen may not marry his daughter; the proof being that Adam did not marry his daughter. But that proof is fallacious: The reason was that Cain should marry his sister, so that the world should be built up by [Adam's] grace.
Shenei Luchot HaBerit
ויאמר לרשע. Even raising one's hand without actually striking makes one a wicked person.
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Orchot Tzadikim
He who smites his companion and causes him pain, whether it be in money matters or through fraudulent words, there is no atonement for him unless he can appease his companion. And the Day of Atonement atones only for sins that are between man and God. But as for sins between him and his fellow man, he must first appease him (Yoma 85b). He who lifts his hand against his companion, even though he did not smite him, is called a wicked man (Sanh. 58b), and he must ask forgiveness of him: only thus can he do atonement.
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