New Revised Standard Version
Then Boaz said, “The day you acquire the field from the hand of Naomi, you are also acquiring Ruth the Moabite, the widow of the dead man, to maintain the dead man’s name on his inheritance.”

Contemporary English Version
"If you do buy it from Naomi," Boaz told him, "you must also marry Ruth. Then if you have a son by her, the property will stay in the family of Ruth's first husband."

New American Bible
Boaz continued, “When you acquire the field from Naomi, you also acquire responsibility for Ruth the Moabite, the widow of the late heir, to raise up a family for the deceased on his estate.”

Douay-Rheims Bible
And Booz said to him: When thou shalt buy the field at the woman's hand, thou must take also Ruth, the Moabitess, who was the wife of the deceased: to raise up the name of thy kinsman in his inheritance.

And Booz said to him: When thou shalt buy the field at the woman's hand, thou must take also Ruth, the Moabitess, who was the wife of the deceased: to raise up the name of thy kinsman in his inheritance.

What day.

to raise up

Ruth 3:12,13 Neither do I deny myself to be near of kin, but there is another nearer than I. . . .

Genesis 38:8 Juda, therefore, said to Onan his son: Go in to thy brother's wife and marry her, that thou mayst raise seed to thy brother.

Deuteronomy 25:5,6 When brethren dwell together, and one of them dieth without children, the wife of the deceased shall not marry to another: but his brother shall take her, and raise up seed for his brother: . . .

Matthew 22:24 Saying: Master, Moses said: If a man die having no son, his brother shall marry his wife and raise up issue to his brother.

Luke 20:28 Saying: Master, Moses wrote unto us: If any man's brother die, having a wife, and he leave no children, that his brother should take her to wife and raise up seed unto his brother.