John Wesley on Numbers 5:23

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.