Genesis 4:4

4:4 But Abel brought some of the firstborn of his flock – even the fattest of them. And the Lord was pleased with Abel and his offering,

Genesis 25:13

25:13 These are the names of Ishmael’s sons, by their names according to their records: Nebaioth (Ishmael’s firstborn), Kedar, Adbeel, Mibsam,

Genesis 36:15

36:15 These were the chiefs among the descendants of Esau, the sons of Eliphaz, Esau’s firstborn: chief Teman, chief Omar, chief Zepho, chief Kenaz,

Genesis 41:51

41:51 Joseph named the firstborn Manasseh, saying, “Certainly God has made me forget all my trouble and all my father’s house.”

Genesis 43:33

43:33 They sat before him, arranged by order of birth, beginning with the firstborn and ending with the youngest. The men looked at each other in astonishment.

Genesis 46:8

46:8 These are the names of the sons of Israel who went to Egypt – Jacob and his sons:

Reuben, the firstborn of Jacob.

Genesis 48:18

48:18 Joseph said to his father, “Not so, my father, for this is the firstborn. Put your right hand on his head.”