Where it appears

• Gen 19:31The firstborn said to the younger, “Our father is old, and there is not a man in the earth to come in to us in the way of all the earth.
• Gen 19:33They made their father drink wine that night: and the firstborn went in, and lay with her father. He didn’t know when she lay down, nor when she arose.
• Gen 19:34It came to pass on the next day, that the firstborn said to the younger, “Behold, I lay last night with my father. Let us make him drink wine again, tonight. You go in, and lie with him, that we may preserve our father’s family line. ”
• Gen 19:37The firstborn bore a son, and named him Moab. He is the father of the Moabites to this day.
• Gen 29:26Laban said, “It is not done so in our place, to give the younger before the firstborn.
• 1 Sam 14:49Now the sons of Saul were Jonathan, Ishvi, and Malchishua; and the names of his two daughters were these: the name of the firstborn Merab, and the name of the younger Michal.