Why God Pointed to the New Moon for Moses with His Finger

Midrash Tanchuma Buber, Bo 10:1

[(Exodus 12:2:) "THIS NEW MOON" (i.e., "THIS MONTH").] Rabbi Samuel bar Abba said: Every new moon that is born from the sixth hour [of the day] and earlier, the eye has the power to see it; from the sixth hour and later, the eye does not have the power to see it. And that new moon, concerning which the Holy One, blessed be He, spoke to Moses, was born from the sixth hour and later, and the eye did not have the power to see it. So the Holy One, blessed be He, showed it to him with His finger, and said to him: "This new moon."

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Biblical References