What is the meaning of Leviticus 18:13?

You must not have sexual relations

• This opening command sets a clear boundary: God restricts certain sexual behaviors to protect holiness and family integrity (see 1 Thessalonians 4:3–5; Hebrews 13:4).

• The form is direct—“must not”—showing that the Lord’s moral standards are absolute, not situational (compare Exodus 20:14).

• By prohibiting rather than merely discouraging, the text underscores that obedience in sexuality is an act of worship (Romans 12:1).

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with your mother’s sister

• The relationship in view is an aunt on the maternal side. God safeguards the extended family just as He does the immediate family (Leviticus 18:7–8).

• Such unions blur generational lines and erode respect for parental authority (Ephesians 6:2).

• The prohibition preserves household order and prevents exploitation of vulnerable family members (1 Timothy 5:2).

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for she is your mother’s close relative

• The rationale grounds the command in kinship: the aunt shares your mother’s flesh and honor (Genesis 2:23; Ruth 3:9).

• Violating this bond would dishonor both mother and aunt, breaking the fifth commandment’s call to honor parents (Exodus 20:12).

• God’s law values relational boundaries because they mirror His covenant order among His people (Deuteronomy 7:6).

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summary

Leviticus 18:13 forbids sexual intimacy with a maternal aunt to protect the sanctity of family, uphold respect across generations, and reflect God’s holy order. The verse reaffirms that obedience in sexual matters is non-negotiable for those who belong to the Lord.