Ruth 4:10 (KJV): "Moreover Ruth the Moabitess, the wife of Mahlon, have I purchased to be my wife, to raise up the name of the dead upon his inheritance, that the name of the dead be not cut off from among his brethren, and from the gate of his place: ye are witnesses this day."
Boaz publicly declares his redemption of Ruth. The term "purchased" refers to the kinsman-redeemer practice, where a relative would buy back property and marry the widow to preserve the family line.
This phrase indicates the purpose of the marriage: to produce an heir who would carry on Mahlon's name and inherit his property. The child would legally be considered Mahlon's descendant, ensuring his memory and lineage continued.
In ancient Israel, having one's name "cut off" meant complete obliteration from family records and memory. This was considered a tragedy, as one's legacy would be lost forever.
The city gate was where legal transactions occurred and community decisions were made. Being remembered "at the gate" meant maintaining social and legal standing in the community.
Boaz calls upon the elders and people as legal witnesses to validate this transaction according to the customs and laws of Israel.
Deuteronomy 25:5-6: "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. And it shall be, that the firstborn which she beareth shall succeed in the name of his brother which is dead, that his name be not put out of Israel."
This law established the levirate marriage system. While Boaz wasn't Mahlon's brother, he acted as kinsman-redeemer, fulfilling a similar purpose - preserving the family line.
The kinsman-redeemer law specifically focused on producing actual physical children who would: