Genesis 7:2-3

7:2 You must take with you seven of every kind of clean animal, the male and its mate, two of every kind of unclean animal, the male and its mate, 7:3 and also seven of every kind of bird in the sky, male and female, to preserve their offspring on the face of the earth.

Genesis 7:8-9

7:8 Pairs of clean animals, of unclean animals, of birds, and of everything that creeps along the ground, 7:9 male and female, came into the ark to Noah, just as God had commanded him.

Genesis 7:15-16

7:15 Pairs of all creatures that have the breath of life came into the ark to Noah. 7:16 Those that entered were male and female, just as God commanded him. Then the Lord shut him in.