Your wrong! The Bible defines it in Leviticus Chapter 20.
It's amazing to me how people can just pick and choose biblical passages to quote and supposedly follow when it suits their needs.
There's a whole bunch of passages about when it is appropriate to stone someone to death. I wonder if the people who quote the bible as a way of showing hatred for gays and lesbians to simply be allowed to live and love as everyone else does, follow these recommendations:
For cursing or blaspheming
And he that blasphemeth the name of the LORD, he shall surely be put to death, and all the congregation shall certainly stone him. Leviticus 24:16
For adultery (including urban rape victims who fail to scream loud enough)
If a damsel that is a virgin be betrothed unto an husband, and a man find her in the city, and lie with her; Then ye shall bring them both out unto the gate of that city, and ye shall stone them with stones that they die; the damsel, because she cried not, being in the city. Deuteronomy 22:23-24
For a woman who is not a virgin on her wedding night
If any man take a wife, and go in unto her, and hate her ... and say, I took this woman, and when I came to her, I found her not a maid: Then shall the father of the damsel, and her mother, take and bring forth the tokens of the damsel's virginity unto the elders of the city in the gate: And the damsel's father shall say ... these are the tokens of my daughter's virginity. And they shall spread the cloth before the elders of the city. ... But if this thing be true, and the tokens of virginity be not found for the damsel: Then they shall bring out the damsel to the door of her father's house, and the men of her city shall stone her with stones that she die. Deuteronomy 22:13-21
For disobeying parents, kill your son with stones.
If a man have a stubborn and rebellious son, which will not obey the voice of his father, or the voice of his mother ... Then shall his father and his mother lay hold on him, and bring him out unto the elders of his city ... And they shall say unto the elders of his city, This our son is stubborn and rebellious, he will not obey our voice; he is a glutton, and a drunkard. And all the men of his city shall stone him with stones, that he die. Deuteronomy 21:18-21
For breaking the Sabbath
They found a man that gathered sticks upon the sabbath day. ... And the LORD said unto Moses, The man shall be surely put to death: all the congregation shall stone him with stones.... And all the congregation brought him without the camp, and stoned him with stones, and he died; as the LORD commanded Moses. Numbers 15:32-56