THEOSISCyrill of Alexandria
Moreover, he states that it is profoundly disgusting and repulsive for any item touched by “he who pours out seed... pouring out seed” to become defiled, even if he cleanses his hands with water. If anyone comes into contact with this person, they also partake in the guilt of impurity; similarly, those who themselves are clean will also incur guilt if they approach him. Consequently, he went out with the lepers, isolating himself from the camp and avoiding all contact with them, even to the point of tainting those he encountered by merely touching them.
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The law instructs us to distance ourselves as much as possible from those who pour out seed, conveying a lesson about disengaging from individuals inclined toward wickedness and boldly warding off those whom God detests due to their continuous state of impurity; indeed, it is a serious matter to associate with the wicked. As it is written, “He that toucheth the pitch shall be defiled” (Sir. 13:1). A person who pours out seed contaminates everything he touches—his bed, his body, bowls, water, and wooden vessels. This serves as a profound reminder that anyone spiritually close to him shares in his inherent impurity. For it is written, “Keep thyself pure, and be not partaker of another man's sin” (1 Tim. 5:22).