Exodus 21:7
And if a man sell his daughter to be a maidservant, she shall not go out as the menservants do.
Cross-reference
Exodus 21:2
Contrast
Exodus 21:2 provides the general rule for male Hebrew servants going free after six years, contrasting with the daughter's different treatment here.
Nehemiah 5:5
Historical context
Nehemiah 5:5 describes the same practice of selling daughters into slavery due to debt, showing the real-life application of this law.