The Evangelist was so far from being content with his single testimony, that he refers the whole to the Apostles, seeking from them a confirmation of his words; and therefore he adds, as they handed them down to us, who were themselves from the beginning eyewitnesses.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Comm. in Act. Apost. Hom. i.