"So that, on the one hand, then, are the mysteries which were hid till the time of the apostles, and were delivered by them as they received from the Lord, and, concealed in the Old Testament, were manifested to the saints."Clement
Stromata Bk. 5 Ch. X, Vol. 2

"Ye are initiated into the mysteries of the Gospel with Paul, the holy, the martyred, inasmuch as he was “a chosen vessel;"Ignatius (Disciple of Apostle John)
Epistle to the Ephesians Ch. II, Vol. 1

"These men, preserving the true tradition of the blessed doctrine, directly from the holy apostles, Peter and James and John and Paul, the son receiving it from the father (but few were like the fathers), have come by God's will even to us to deposit those ancestral and apostolic seeds."Eusebius
Eusebius Ch. 11 Vol. 5

Challenge me to front the apostolic line of battle; look at his Epistles: they all keep guard in defense of modesty, of chastity, of sanctity; they all aim their missiles against the interests of luxury, and lasciviousness, and lust. What, in short, does he write to the Thessalonians withal? “For our consolation (originated) not of seduction, nor of impurity:” and, “This is the will of God, your sanctification, that ye abstain from fornication; that each one know how to possess his vessel in sanctification and honor, not in the lust of concupiscence, as (do) the nations which are ignorant of God.” (1Th_4:3-5)Tertullian
On Modesty Ch. XVII, Vol. 4

"And then a teacher, to train and guide the soul to all requisite knowledge when it is made able to admit the revelation of the Word. Eagerly desiring, then, to perfect us by a gradation conducive to salvation, suited for efficacious discipline, a beautiful arrangement is observed by the all-benignant Word, who first exhorts, then trains, and finally teaches."Clement
Instructor Bk. I Ch. I, Vol. 1

"All then are good together, the law, the prophets, the apostles, and the whole company [of others] that have believed through them: only if we love one another."Ignatius (Disciple of Apostle John)
Epistle to the Philippians Ch. IX, Vol. I

"And [the Scripture saith], “My son, honor thou God and the king (high priest).” (Pro_24:21) And say I, Honor thou God indeed, as the Author and Lord of all things, but the bishop as the high-priest, who bears the image of God — of God. Inasmuch as he is a ruler, and of Christ, in his capacity of a priest."Ignatius (Disciple of Apostle John)
Epistle to Smyrnaeans Ch. IX, Vol. 1