Cyrill of Alexandria
Furthermore, it is stated that any vessel upon which “he who pours out seed... pouring out seed” touches will be considered unclean, regardless of whether he cleanses his hands with water. If someone makes contact with his body, they too become liable to the burden of impurity; similarly, even those who are clean will be rendered guilty if they approach him. Consequently, he departed from the camp along with the lepers, remaining isolated from everyone and having no interaction even to the extent of touching those he encountered, thus contaminating them.
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The law instructs us to maintain as great a distance as possible from him who pours out seed, teaching us to particularly avoid association with those inclined towards evil and to firmly reject those whom God detests, marked by the continual stain of impurity. For it is indeed perilous to ally oneself with wicked individuals. The scripture rightly affirms, “He that toucheth the pitch shall be defiled” (Sir. 13:1). He who pours out seed contaminates everything he touches—his bed, his body, his utensils, waters, and wooden vessels. This remarkable principle illustrates that anyone who is even spiritually close to him will partake of his inherent defilement. As it is also written, “Keep thyself pure, and be not partaker of another man's sin” (1 Tim. 5:22).