וַיְצַ֣ו פַּרְעֹ֔ה לְכָל־עַמּ֖וֹ לֵאמֹ֑ר כָּל־הַבֵּ֣ן הַיִּלּ֗וֹד הַיְאֹ֙רָה֙ תַּשְׁלִיכֻ֔הוּ וְכָל־הַבַּ֖ת תְּחַיּֽוּן׃ (ס)
And Pharaoh charged all his people, saying: ‘Every son that is born ye shall cast into the river, and every daughter ye shall save alive.’
Read halakhic rulings (Jewish law) on Exodus 1:22: and classical halakhic sources.