Arator : Three times the voice of the Lord resounds. This is repeated for [our] salvation: the Father and the Son and the Holy Spirit do this together. Arius, contentious against this faith, fell by denying that the One is in three Persons; Sabellius admitted the One, but [it is] the Father, he said, who then in turn is called Son and Holy Spirit, being the same, but so that the whole is the Father himself; and what the One greatest contains in its threefold order the former divides and the latter abandons. Both lie vanquished; for the threefold command of the [Lord's] bidding indicates a single number in [three] Persons, with their own qualities, [and] by this command he calls the Gentiles: to believe this is right, if we wish to believe perfectly. — ON THE ACTS OF THE APOSTLES 1 Bede : Now this happened three times, because the mystery of the Holy Trinity was to be preached by the twelve apostles to the four parts of the world, therefore four lines were let down from heaven a third time. Or as blessed Ambrose interprets, the figure repeated three times expressed the operation of the Trinity. And therefore, in mysteries, a triple question is put forth and a triple confirmation is celebrated, nor can anyone be purified except by a triple confession. Hence, Peter himself in the Gospel is asked three times whether he loves the Lord, so that by a triple response he might loosen the chains that he bound by denying the Lord. These things were shown to Peter opportunely, when Cornelius the gentile sent to summon him, so that he would not hesitate to deliver the Christian faith to the uncircumcised. For he was like those animals shown in the vessel by the Gospel. Hence also by the Holy Spirit he is confirmed to do the same. — Commentary on Acts Bede : And immediately the vessel was received into heaven. After the third submission, the sheet is taken up to heaven, because after the conversation of this world, in which the Church sojourns purified by faith and baptism, the blessed and eternal heavenly habitation follows. — Commentary on Acts John Chrysostom : "This was done thrice: and the vessel was received up again into heaven." For, that it may not seem to be a mere fancy, "this was done thrice." And yet it was the same Lord that had discoursed above in the Law concerning things clean and unclean. But in that sheet were also all the four-footed beasts of the earth: the clean with the unclean. — Homily on Acts 22 Origen of Alexandria : For the things made clean are made clean not by a single invocation nor by a second, but unless a third invocation is pronounced, no one is cleansed. For unless you were cleansed in the Father and the Son and the Holy Spirit, you could not be clean. — HOMILIES ON Leviticus 7.4.5