In the lead-up to the plague of locust, G-d tells Moses, â
Bo el Pharaoh â Come to Pharaohâ (Exodus 10:1). Many commentators are troubled by this strange verbiage as one would have otherwise expected G-d to say, â
Lech el Pharaoh â Go to Pharaoh,â which is what He says to Moses in telling him to warn Pharaoh about the plague of blood (ibid. 7:15).
The
boâ has a
gematria of three, which alludes to the fact that three more plagues were left at that point until the Exodus. Rabbi Menachem Mendel Kasher (1895-1983), however, notes that Hashem uses the word â
boâ instead of â
lechâ two other times when telling Moses to meet Pharaoh (ibid., 7:26 and 9:1), and at neither of those points were three plagues remaining.