. Bilhah

And Laban gave to Rachel his daughter Bilhah his handmaid to be her maid.
Genesis 29:29 KJV

And she said,
Behold my maid Bilhah,
go in unto her;
and she shall bear upon my knees,
that I may also have children by her.
Genesis 30:3 KJV

And she gave him Bilhah her handmaid to wife:
and Jacob went in unto her.
Genesis 30:4 KJV

And Bilhah conceived,
and bare Jacob a son.
Genesis 30:5 KJV

And Bilhah Rachel's maid conceived again,
and bare Jacob a second son.
Genesis 30:7 KJV

And it came to pass,
when Israel dwelt in that land,
that Reuben went and lay with Bilhah his father's concubine:
and Israel heard it.
Now the sons of Jacob were twelve:
Genesis 35:22 KJV

And the sons of Bilhah,
Rachel's handmaid;
Dan,
and Naphtali:
Genesis 35:25 KJV

These are the generations of Jacob.
Joseph,
being seventeen years old,
was feeding the flock with his brethren;
and the lad was with the sons of Bilhah,
and with the sons of Zilpah,
his father's wives:
and Joseph brought unto his father their evil report.
Genesis 37:2 KJV

These are the sons of Bilhah,
which Laban gave unto Rachel his daughter,
and she bare these unto Jacob:
all the souls were seven.
Genesis 46:25 KJV