When the magicians of Egypt finally conceded defeat during the plague of kinim, lice, they turned to Pharaoh and said, “Etzba Elokim hi—This is the finger of G-d” (Shemos 8:15).
But why a finger? And why do they say this specifically at that point—during the plague of lice—and not earlier, during the plague of blood or frogs? What changed?
The Ostrovtzer Rebbe in sefer Me’ir Einei Chachamim offers a brilliant explanation.
Chazal tell us something astonishing (Eruvin 21a). The size of the entire world is half an amah. Rashi explains that this measurement is not measured by our amah, but by Hashem’s amah.
An amah is six tefachim. Half an amah is therefore three tefachim. So in terms of Hashem, the entire world measures three tefachim.
Chazal tell us elsewhere that the world measures approximately 6,000 parsa. Egypt, by contrast, measures 400 parsa by 400 parsa (Pesachim 94a).
If we do the math, Egypt is one-fifteenth of the world (6,000 divided by 400).
The Gemara (Menachos 41b) states that one tefach equals five fingers, when utilizing the middle finger as the reference. Therefore, if the world is three tefachim, the world equals 15 fingers in the “hand,” so to speak, of Hakadosh Baruch Hu.
Fifteen fingers equals the whole world, and Egypt is one-fifteenth of the world, which puts Egypt corresponding to one finger.
Now everything makes sense. Blood and frogs spread wherever there was water. They were devastating plagues, but not geographically spanning every part of Egypt. But kinim, lice, covered every inch throughout the entire land of Egypt.
As such, for the first time, a plague encompassed one complete “finger” of Divine measure. And that is why the magicians said what they said and exactly then: “Etzba Elokim hi—This the finger of G-d.”
It wasn’t simply a metaphor. It was precise. “This is no longer magic,” they said. “This is no longer coincidence. We are witnessing a Divine act measured, exact, and complete—a full finger’s worth of the world touched by Hakadosh Baruch Hu.”
