Deuteronômio 13:16 Midrash: Mekhilta DeRabbi Yishmael, Midrash Tanchuma, Ein Yaakov (Glick Edition) & Vayikra Rabbah

(Exodus 14:4) "And I shall strengthen Pharaoh's heart": for it was divided, whether to pursue or not to pursue. "and I will be honored through (the downfall of) Pharaoh and all of his host": Pharaoh initiated the transgression, viz. (Exodus 1:22) "Every son that is born, into the Nile shall you throw him." Since he initiated the transgression, first he and then all of his host were drowned. Similarly, (Genesis 7:23) "And He blotted out every being … from man until beast, etc." The initiator was punished first. Similarly, (Ibid. 19:11) "And the men at the entrance of the house, etc." The initiators were punished first. Here, too, "and I will be honored through (the downfall of) Pharaoh, etc." The initiator was punished first. Now does this not follow a fortiori? If in the (L–rd's) measure of punishment, the lesser, the initiator of the transgression is punished first, then in his measure of reward, the greater, how much more so (is the converse true)!

Similarly, in the verse And he blotted out every living substance which was upon the face of the ground, both man and cattle (Gen. 7:3). He mentioned man first, because man was the first to sin, and after that he refers to beasts and creeping things. Likewise, since Scripture states: And they smote the men that were at the door with blindness, both small and great (ibid. 19:11), they smote the least important ones first and then the greater ones. Likewise, in accordance with the verse I will smite all the firstborn in the land of Egypt, both man and beast, man was punished first and then the beast. Another illustration is in the verse Thou shalt surely smite the inhabitants of that city with the edge of the sword (Deut. 13:16). He smote the inhabitants of the city with the sword, and then he slew the cattle. Similarly, And her belly shall swell (Num. 5:27) is followed by And her thighs shall fall away. That is, the part of the body that sinned first was punished first. Is it not logical to conclude that if retribution is exacted first from the one who commits an evil deed first, then the reward for good deeds, whose reward is far greater, is dispensed according to the same rule.

Similarly, (Devarim 13:16) "Smite the inhabitants of that city … and its cattle." Similarly, (Numbers 5:27) "and her belly ('first in the transgression') will swell, and her thigh will fall."