Genesis 46:27

46:27 Counting the two sons of Joseph who were born to him in Egypt, all the people of the household of Jacob who were in Egypt numbered seventy.

Exodus 1:5

1:5 All the people who were directly descended from Jacob numbered seventy. But Joseph was already in Egypt,

Acts 7:14

7:14 So Joseph sent a message and invited his father Jacob and all his relatives to come, seventy-five people in all.