Comentario sobre Exodo 1:22

לכל עמו This may be translated AND PHARAOH GAVE COMMAND REGARDING ALL (לכל) HIS PEOPLE — Regarding them, too, he made a decree (Sotah 12a). For on the day when Moses was born his astrologers said to him, “To-day their deliverer has been born, but we know not whether he is born of an Egyptian father or of an Israelite; but we see by our astrological art that he will ultimately suffer misfortune through water”. Pharaoh therefore made a decree that day regarding the Egyptians also, as it is said here, “Every son that is born [ye shall cast into the river]”, and it is not stated “[every son] who is born to the Hebrews”. They (the astrologers), however, were not aware that Moses was ultimately to suffer misfortune through the waters of Meribah and not through the waters of the Nile (Exodus Rabbah 1:18; Sotah 12a; cf. also Rashi on Numbers 20:13).

ויצו פרעה לכל עמו לאמר, the meaning of the line is: “and this is what he said to them.” Every time the word לאמר occurs in the Torah it implies a repetition of words spoken which had been introduced either with the word ויצו or ויקרא, or וידבר, or ויאמר as we explained in connection with Genesis 8,15.

ויצו פרעה לכל עמו, Pharaoh commanded his entire nation, etc. Whereas originally Pharaoh's command to the midwives to kill new born boy babies was a secret deal between him and the midwives, something the Hebrew women did not know about, now, in view of the failure of that plan, he resorted to a public announcement; he believed that in view of the continued expansion of the Israelite population he would have popular support for such a draconian measure. An additional factor forcing Pharaoh's hand to go public with the decree to drown all boy babies may have been that according to astrologers Pharaoh foresaw that the redeemer of the Israelites would be born and would end his career prematurely due to water (Sanhedrin 101). Pharaoh mobilised every Egyptian to participate in this decree in order to precipitate this event.