from Latin levir, "a husband's brother," the name of an ancient custom ordained by Moses, by which, when an Israelite died without issue, his surviving brother was required to marry the widow, so as to continue his brother's family through the son that might be born of that marriage (Ge 38:8; De 25:5-10; comp. Ru 3; 4:10). Its object was "to raise up seed to the departed brother."
And Judah said to Onan, Go in to your brother's wife, and marry her, and raise up seed to your brother.
If brothers live together, and one of them dies and has no child, the wife of the dead shall not marry outside to a stranger. Her husband's brother shall go in to her and take her as a wife for himself, and perform the duty of a husband's brother to her. And it shall be, the first-born whom she bears shall succeed in the name of his dead brother, so that his name may not be put out of Israel. read more. And if the man does not want to take his brother's wife, then let his brother's wife go up to the gate to the elders and say, My husband's brother refuses to raise up a name in Israel to his brother. He will not perform my levirate. Then the elders of his city shall call him and speak to him. And if he stands and says, I do not desire to take her, then his brother's wife shall come to him in the presence of his elders, and take off his shoe from his foot, and spit in his face, and shall answer and say, So shall it be done to that man who will not build up his brother's house. And his name shall be called in Israel, The house of him who has his shoe taken off.