#who slept with her

It is implied that Jacob did not know he was with Leah because it was dark and he could not see. (See: [[:en:ta:vol1:translate:figs_explicit]])

#Laban gave his female servant Zilpah ... her servant

Here the author gives background information about Laban giving Zilpah to Leah. Most likely he gave Zilpah to Leah before the wedding. (See: [[:en:ta:vol2:translate:writing_background]])

#Zilpah

This is the name of Leah's female servant. (See: [[:en:ta:vol1:translate:translate_names]])

#behold, it was Leah

The word "behold" here shows that Jacob was surprised by what he saw. AT: "Jacob was surprised to see it was Leah in bed with him"

#What is this you have done to me?

Jacob uses a question to express his anger and surprise. AT: "I cannot believe you did this to me!" (See: [[:en:ta:vol1:translate:figs_rquestion]])

#Did I not serve you for Rachel?

Jacob uses these questions to express his hurt that Laban had tricked him. AT: "I served you for seven years to marry Rachel!" (See: [[:en:ta:vol1:translate:figs_rquestion]])