When copies of the three Gospels had come to the Evangelist John, he is reported, while he confirmed their fidelity and correctness, to have at the same time noticed some omissions, especially at the opening of our Lord’s ministry. Certain it is that the first three Gospels seem only to contain the events of the year in which John the Baptist was imprisoned, and put to death. And therefore John, it is said, was asked to write down those acts of our Saviour’s before the apprehension of the Baptist, which the former Evangelists had passed over. Any one then, by attending, will find that the Gospels do not disagree, but that John is relating the events of a different date, from that which the others refer to.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Euseb. Eccl. Hist. l. iii. c. 24