Moses
Numbers 5:23ESV·traditional attribution

“Then the priest shall write these curses in a book and wash them off into the water of bitterness.

Matthew Henry Presbyterian @wholebiblehenry

We have here the law concerning the solemn trial of a wife whose husband was jealous of her. Observe, I. What was the case supposed: That a man had some reason to suspect his wife to have committed adultery, Num 5:12-14. Here, 1. The sin of adultery is justly represented as an exceedingly sinful sin; it is going aside from God and virtue, and the good way, Pro 2:17.

Commenting on Numbers 5:11-31

John Gill Reformed Baptist @doctorgill

And the priest shall write these curses in a book,.... The above curses imprecated on herself by an oath; the words and the letters of them were written at length, in a scroll of parchment; and, as some say also, her name, but not her double amen to them (y): and he shall blot them out with the bitter water: wash them out with it...

Jamieson-Fausset-Brown Reformed @jfbcommentary

write these curses in a book--The imprecations, along with her name, were inscribed in some kind of record--on parchment, or more probably on a wooden tablet. blot them out with the bitter water--If she were innocent, they could be easily erased, and were perfectly harmless; but if guilty, she would experience the fatal effects of the water she had drunk.