This verse is the prohibition against incest with a granddaughter. The prohibition against incest with a daughter appears… nowhere! Obviously, it’s prohibited, but where is the textual source? The Talmud in Yevamos (3a) derives the prohibition from a gezeira shava (comparison of identical terms) between our verse and the prohibition against a man having relations (separately) with both a woman and her daughter (verse 17). Incest with a daughter is one of the 613 mitzvos – and a capital crime – yet there’s nothing explicit about it in the Written Torah!