C. F. Keil and Franz Delitzsch on Numbers 12:11-12

Num 12:11-12

When Aaron saw his sister smitten in this way, he said to Moses, “Alas! my lord, I beseech thee, lay not this sin upon us, for we have done foolishly;” i.e., let us not bear its punishment. “Let her (Miriam) not be as the dead thing, on whose coming out of its mother’s womb half its flesh is consumed;” i.e., like a still-born child, which comes into the world half decomposed. His reason for making this comparison was, that leprosy produces decomposition in the living body.