Not sure if this is what you are looking for, but this is an excerpt from Eusebius of Caesaria. It can be found in The Church History of Eusebius. In P. Schaff & H. Wace (Eds.), A. C. McGiffert (Trans.), Eusebius: Church History, Life of Constantine the Great, and Oration in Praise of Constantine (Vol. 1, pp. 238–239).
6 I remember the events of that time more clearly than those of recent years. For what boys learn, growing with their mind, becomes joined with it; so that I am able to describe the very place in which the blessed Polycarp sat as he discoursed, and his goings out and his comings in, and the manner of his life, and his physical appearance, and his discourses to the people, and the accounts which he gave of his intercourse with John and with the others who had seen the Lord. And as he remembered their words, and what he heard from them concerning the Lord, and concerning his miracles and his teaching, having received them from eyewitnesses of the ‘Word of life,’ Polycarp related all things in harmony with the Scriptures.
7 These things being told me by the mercy of God, I listened to them attentively, noting them down, not on paper, but in my heart. And continually, through God’s grace, I recall them faithfully. And I am able to bear witness before God that if that blessed and apostolic presbyter had heard any such thing, he would have cried out, and stopped his ears, and as was his custom, would have exclaimed, O good God, unto what times hast thou spared me that I should endure these things? And he would have fled from the place where, sitting or standing, he had heard such words.
8 And this can be shown plainly from the letters which he sent, either to the neighboring churches for their confirmation, or to some of the brethren, admonishing and exhorting them.” Thus far Irenæus.
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