Eliezer ben Jacob I (Hebrew: אליעזר בן יעקב) was a Tanna of the 1st century; contemporary of Eleazar Chisma and Eliezer ben Hyrcanus, and senior to Judah ben Ilai.[1]
Of his personal history nothing is known, except that he had seen the Temple at Jerusalem and was familiar with the specific purposes of its many apartments, a subject on which he was considered an authority.[2] Some of the details, however, he eventually forgot, and was reminded of them by Abba Saul ben Batnit.[3]
Simon ben Azzai, Rabbi Akiva's contemporary, relates that he had discovered a genealogical roll wherein was stated, "The Mishnah of R. Eliezer ben Jacob is only a kab [small in proportion], but clean [of all deficiencies]";[4] [5] as a result, subsequent generations generally adopted Eliezer's views as law.[6]
In the aggadah, too, he is mentioned. According to him, Deuteronomy 11:13 ("To serve Him with all your heart and with all your soul") is an admonition to the priests that, when officiating, they shall entertain no thought foreign to their duty.[7]
Eliezer ben Jacob bequeathed to Israel many agrarian laws, such as the laws concerning the bringing of the Bikkurim to Jerusalem and who is eligible to recite the Avowal,[8] as well as the laws concerning Kil'ayim grown in a vineyard.[9]
He is buried near the old Kefar Hanaiah, in Galilee.[10]