שְׁנַ֨יִם שְׁנַ֜יִם בָּ֧אוּ אֶל־נֹ֛חַ אֶל־הַתֵּבָ֖ה זָכָ֣ר וּנְקֵבָ֑ה כַּֽאֲשֶׁ֛ר צִוָּ֥ה אֱלֹהִ֖ים אֶת־נֹֽחַ׃
there went in two and two unto Noah into the ark, male and female, as God commanded Noah.
Read halakhic rulings (Jewish law) on Genesis 7:9: and classical halakhic sources.