Sefer HaMitzvot, Positive Commandments
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היא שצונו לגרש בשטר עכ"פ כשנתרצה לגרש והוא אמרו יתברך וכתב לה ספר כריתות. וכבר התבארו משפטי מצוה זו בשלמות במסכת גיטין. (כי תצא, נשים הלכות גירושין):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
That is that He commanded us - if one wants to divorce - to divorce with a contract under all circumstances. And that is His, may He be exalted, saying, "he shall write her a scroll of divorce" (Deuteronomy 24:1). And the regulations of this commandment have already been completely explained in Tractate Gittin. (See Parashat Ki Tetzei; Mishneh Torah, Divorce)