Genesis 10:15

“And Canaan begat Sidon his firstborn, and Heth,”

Genesis 22:21

“Huz his firstborn, and Buz his brother, and Kemuel the father of Aram,”

Genesis 25:13

“And these are the names of the sons of Ishmael, by their names, according to their generations: the firstborn of Ishmael...”

Genesis 27:19

“And Jacob said unto his father, I am Esau thy firstborn; I have done according as thou badest me: arise, I pray thee, si...”

Genesis 27:32

“And Isaac his father said unto him, Who art thou? And he said, I am thy son, thy firstborn Esau.”