Imamat 18:16

18:16 You must not have sexual intercourse with your brother’s wife; she is your brother’s nakedness. ¹ 

Imamat 18:10

18:10 You must not expose the nakedness of your son’s daughter or your daughter’s daughter by having sexual intercourse with them, because they are your own nakedness. ² 

[18:16]  ¹ sn Regarding the last clause, see the notes on vv. 7 and 10 above.

[18:10]  ² sn That is, to have sexual intercourse with one’s granddaughter would be like openly exposing one’s own shameful nakedness (see the note on v. 7 above).