In a book — That is, in a scroll of parchment, which the Hebrews commonly call a book. Blot them out — Or scrape them out and cast them into the bitter water. Whereby it was signified, that if she was innocent, the curses should be blotted out and come to nothing; and, if she were guilty, she should find in her the effects of this water which she drank, after the words of this curse had been scraped and put in.
Related Commentaries of Numbers 5:23
Numbers 5:23
23 And the priest shall write these curses in a book, and he shall blot them out with the bitter water: