Deuteronomy 25:5

“If brothers are living together and one of them dies without a son, the widow of the deceased shall not be married outside the family to a stranger. Her husband’s brother shall be intimate with her after taking her as his wife and perform the duty of a husband’s brother to her.

Matthew 22:24

saying, “Teacher, Moses said, ‘If a man dies, leaving no children, his brother as next of kin shall marry his widow, and raise children for his brother.’

Mark 12:19

“Teacher, Moses wrote for us [a law] that if a man’s brother dies and leaves a wife but leaves no child, his brother is to marry the widow and raise up children for his brother.

Luke 20:28

and they questioned Him, saying, “Teacher, Moses wrote for us [a law that] if a man’s brother dies, leaving a wife and no children, his brother should marry the wife and raise children for his brother.

Genesis 38:8-9

Then Judah told Onan, “Go in to your brother’s widow, and perform your duty as a brother-in-law [under the levirate marriage custom]; [be her husband and] raise children for [the name of] your brother.”

Ruth 1:12-13

Go back, my daughters, go, for I am too old to have a husband. If I said I have hope, and if I actually had a husband tonight and even gave birth to sons,

Ruth 3:9

So he said, “Who are you?” And she answered, “I am Ruth your maid. Spread the hem of your garment over me, for you are a close relative and redeemer.”

Ruth 4:5

Then Boaz said, “The day that you buy the field from Naomi, you must also acquire Ruth the Moabitess, the widow of the deceased, to restore the name of the deceased to his inheritance.”

Treasury of Scripture Knowledge

Summary

If brethren dwell together, and one of them die, and have no child, the wife of the dead shall not marry without unto a stranger: her husband's brother shall go in unto her, and take her to him to wife, and perform the duty of an husband's brother unto her.

Bible References

Brethren

Matthew 22:24
saying, “Teacher, Moses said, ‘If a man dies, leaving no children, his brother as next of kin shall marry his widow, and raise children for his brother.’
Mark 12:19
“Teacher, Moses wrote for us [a law] that if a man’s brother dies and leaves a wife but leaves no child, his brother is to marry the widow and raise up children for his brother.
Luke 20:28
and they questioned Him, saying, “Teacher, Moses wrote for us [a law that] if a man’s brother dies, leaving a wife and no children, his brother should marry the wife and raise children for his brother.

Husband's brother

Genesis 38:8
Then Judah told Onan, “Go in to your brother’s widow, and perform your duty as a brother-in-law [under the levirate marriage custom]; [be her husband and] raise children for [the name of] your brother.”
Ruth 1:12
Go back, my daughters, go, for I am too old to have a husband. If I said I have hope, and if I actually had a husband tonight and even gave birth to sons,
Ruth 3:9
So he said, “Who are you?” And she answered, “I am Ruth your maid. Spread the hem of your garment over me, for you are a close relative and redeemer.”
Ruth 4:5
Then Boaz said, “The day that you buy the field from Naomi, you must also acquire Ruth the Moabitess, the widow of the deceased, to restore the name of the deceased to his inheritance.”

General references

Genesis 38:8
Then Judah told Onan, “Go in to your brother’s widow, and perform your duty as a brother-in-law [under the levirate marriage custom]; [be her husband and] raise children for [the name of] your brother.”
Leviticus 18:16
You shall not uncover the nakedness of your brother’s wife; it is your brother’s nakedness.
Matthew 14:4
for John had said to him, “It is not lawful (morally right) for you to have her [living with you as your wife].”
Luke 20:28
and they questioned Him, saying, “Teacher, Moses wrote for us [a law that] if a man’s brother dies, leaving a wife and no children, his brother should marry the wife and raise children for his brother.