During the controversy over the Hamburg Reform Temple, Caro published a book called Berit Emet (Dessau, 1820) using the pseudonym "Amittai ben Avida Ahizedek" and with the false imprint "Constantina" (Constantinople). The first part of the book, called Berit Elohim, is divided into three sections: (a) letters to friends on questions of religion and ethics; (b) a defense of the changes introduced in the reformed synagogues; (c) a criticism of the pamphlet Elleh Divrei ha-Berit which had been published in 1818 by the leading Orthodox rabbis in Western Europe, attacking the Hamburg Temple.

The second part, called Berit ha-Kehunnah, o Tekhunat ha-Rabbanim, strongly criticizes the state of the contemporary rabbinate. This was the first open attack by a Haskalah writer upon the rabbinate of his time. The second part of Berit Emet was republished by J. L. Mieses under the title Tekhunat ha-Rabbanim (Vienna, 1823) with the pseudonym of the writer listed as Uriah mi-Mishpahat ha-Falaquera. At the end of the book, Mieses added some remarks of his own. Caro also published poems and essays in Bikkurei ha-Ittim (11, 1830).

בשער: קונסטאנטינה[!]. על מקום ההדפסה עיין י' קלוזנר, היסטוריה של הספרות העברית החדשה, ב, ירושלים תשי"ב, עמ' 275; מ' גרונוואלד, דוד קארו ויהודה ליב מיזס, קרית ספר, יט, תש"ב-תש"ג, עמ' 144. ברית הכהונה יצא בהוצאות הבאות בשם תכונת הרבנים. עיין להלן. לחלק השני "ברית הכהונה או תכונת הרבנים" שער מיוחד.