«فِرَّ مِنَ الْمَجْذُومِ فِرَارَكَ مِنَ الْأَسَدِ»
Avoid a person affected by leprosy as you would a lion.
The instruction reflects precaution within the created order of causes, including efforts to block possible avenues of harm. A harmful outcome is not inevitable in every encounter, yet caution can still be appropriate.
Another explanation notes that illness following contact might encourage a person to attribute the result to self-acting contagion; avoidance can also prevent this mistaken inference. Both readings maintain the essential reconciliation: denying autonomous efficacy does not contradict taking precautions.