Abinadi cries out, "Who shall declare his generation? He then answers his own question: "Behold, I say unto you, that when his soul has been made an offering for sin he shall see his seed" (Mosiah 15:10).
According to Ann Madsen, the cultural reference here to "declaring a generation" may be to the descendants of a man, whose sons declare his generation. Jewish tradition is heavy with the idea that a son must somehow speak for his father after his death. There is a formal ceremony at the grave one year after the father's death in which the son speaks a formulaic prayer in his father's behalf, thus "declaring his generation" and the continuance of "his seed." At this point Abinadi asks--and answers--a question not covered in Isaiah 53: "Who shall be his seed?" [Ann Madsen, "'What Meaneth the Words That Are Written?': Abinadi Interprets Isaiah," in Journal of Book of Mormon Studies, vol. 10, Num. 1, 2001, p. 11]