that the firstborn # 05_DEU_25_06 # 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. 
that the firstborn # 01_GEN_19_34 # And it came to pass on the morrow, that the firstborn said unto the younger, Behold, I lay yesternight with my father: let us make him drink wine this night also; and go thou in, [and] lie with him, that we may preserve seed of our father.