He was so earnestly affected toward Origen, that he urged him to come to that country for the benefit of the churches, and moreover he visited him in Judea, remaining with him for some time, for the sake of improvement in divine things. And Alexander, bishop of Jerusalem, and Theoctistus, bishop of Cæsarea, attended on him constantly, as their only teacher, and allowed him to expound the Divine Scriptures, and to perform the other duties pertaining to ecclesiastical discourse.
Historia Ecclesiastica
Book VI, Chapter 27. How the Bishops regarded Origen
1 section
Eusebius of Caesarea
Trans. Arthur Cushman McGiffert, A Select Library of Nicene and Post-Nicene Fathers of the Christian Church, Second Series, Volume I, 1890. Public domain.