Titus 1:6

Clement of Alexandria Stromata Book III

Quid autem ad haec dicunt, qui in legem invehuntur, et in matrimonium, quasi sit solum a lege concessum, non autem etiam in Novo Testamento? Quid ad has leges latas possunt dicere, qui sationem abhorrent et generationem? cure "episcopum" quoque, "qui domui recte praesit,"[229]

Tertullian To His Wife Book I

How detrimental to faith, how obstructive to holiness, second marriages are, the discipline of the Church and the prescription of the apostle declare, when he suffers not men twice married to preside (over a Church[81]

Tertullian On Monogamy

Come, now, you who think that an exceptional law of monogamy is made with reference to bishops, abandon withal your remaining disciplinary titles, which, together with monogamy, are ascribed to bishops.[92]

Constitutions of the Holy Apostles Book VI

We have already said, that a bishop, a presbyter, and a deacon, when they are constituted, must be but once married, whether their wives be alive or whether they be dead; and that it is not lawful for them, if they are unmarried when they are ordained, to be married afterwards; or if they be then married, to marry a second time, but to be content with that wife. which they had when they came to ordination.[86]