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In Parashas Korach, Moshe Rabbeinu announced that the events that were about to unfold would establish clearly whether or not Korach was right in his challenge. “Through this shall you know that Hashem has sent me to perform all these acts, for it was not from my heart. If these die like the death of all men, and pekudas kol ha’adam yipakeid aleihem, then it is not Hashem who has sent me” (Bamidbar 16:28–29). What is the meaning of the phrase “pekudas kol ha’adam yipakeid aleihem”? The simple meaning is the “destiny of all men is visited upon them.” However, the Gemara in Nedarim (39b) says that from this pasuk there is a hint to bikur cholim. The mefaresh (printed in the place of Rashi) explains the hint is from these very same words. “If these die like the death of all men, and are visited the normal bikur cholim visits, then it is not Hashem who sent me.”
That explains where the hint to bikur cholim is in the verse, but it leaves one wondering why Moshe Rabbeinu would specifically mention bikur cholim now. Why didn’t Moshe Rabbeinu leave out bikur cholim altogether and just say, “If these die like the death of all men, then it is not Hashem who sent me”?