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You may be looking for Jacob ben Reuben

Jacob ben Reuben (Karaite)

Jacob ben Reuben was a Karaite scholar and Bible exegete of the eleventh century. He wrote a brief Hebrew language commentary on the entire Bible, which he entitled Sefer ha-'Osher, because, as he says in the introduction, the reader will find therein sufficient information, and will not need to...

, the Karaite scholar, or Jacob ben Reuben ibn Zur

Jacob ben Reuben ibn Zur

Jacob ben Reuben ibn Zur was a Talmudist and rabbi of Fez. He was born in the latter part of the seventeenth century and died after 1750. That his reputation as a Talmudist stood high is apparent in the responsa of Abraham Ankava, where he is quoted as an authority recognized by all Moroccan...

 of Morocco.

Jacob ben Reuben was a Spanish

History of the Jews in Spain

Spanish Jews once constituted one of the largest and most prosperous Jewish communities under Muslim and Christian rule in Spain, before the majority, together with resident Muslims, were forced to convert to Catholicism, be expelled or be killed when Spain became united under the Catholic Monarchs...

 rabbi

Rabbi

In Judaism, a rabbi is a teacher of Torah. This title derives from the Hebrew word רבי , meaning "My Master" , which is the way a student would address a master of Torah...

 and polemic

Polemic

A polemic is a variety of arguments or controversies made against one opinion, doctrine, or person. Other variations of argument are debate and discussion...

ist of the twelfth century. In response to attacks by the convert Petrus Alphonsi

Petrus Alphonsi

Petrus Alphonsi was a Jewish Spanish writer and astronomer, and polemicist, who converted to Christianity....

, he wrote the Sefer Milhamot Adonai ("Book of the Wars of the Lord"). This work was divided into twelve chapters, and contained, besides refutations of the Christian

Christian

A Christian is a person who adheres to Christianity, an Abrahamic, monotheistic religion based on the life and teachings of Jesus of Nazareth as recorded in the Canonical gospels and the letters of the New Testament...

 arguments drawn from the Tanakh

Tanakh

The Tanakh is a name used in Judaism for the canon of the Hebrew Bible. The Tanakh is also known as the Masoretic Text or the Miqra. The name is an acronym formed from the initial Hebrew letters of the Masoretic Text's three traditional subdivisions: The Torah , Nevi'im and Ketuvim —hence...

, a thorough criticism of the Gospels and the Acts of the Apostles

Acts of the Apostles

The Acts of the Apostles , usually referred to simply as Acts, is the fifth book of the New Testament; Acts outlines the history of the Apostolic Age...

, in which he points out many contradictions.