[Enough has been] said about Moses, and about his rod. But what did Aaron and Hur signify? Certainly, on the journey to the mountain [of Calvary], one Cyrenean helped my Lord carrying [the cross]; but on the mountain itself, no one. The winepress there he trod alone; alone he held [his] outstretched arms, and [his] lifted-up hands, poured out through the night over the whole world of lands. There was none who helped even in the least — not a man, not an Angel — so that he cried out: “My God, my God, why hast thou forsaken me?” Nor can we suppose [that] the two thieves who hung on either side of him brought him even a [single] word of support, since the one loaded him with the insults of words, [and] the other could not sustain the role of an Aaron and a Hur. Some say [that] by those [two] the two Testaments are signified — [Testaments] which sustain us, who are members of the head, [that is], of CHRIST, [and] assiduously prop up the weakness of our faith and hope. St. Jerome (in the cited Epistle) seems to hint at something from the etymology of Aaron and Hur. “Both hands of Moses,” he says, “Aaron and Hur — that is, ‘the mountain-one’ and ‘the shining-one’ — hold up”: not because Hur is from the Hebrew Or, which is “light” (for the aspiration would be lacking), but because to the Hebrews chor, or Hor or Hur, is “noble, illustrious, and famous” — so much so that noble men are called chorin; but clear and lucid speech, laschon mechubbar, as Elias the Tishbite says. Or [is it] that, on the mountain of the Christian Church of men, [there] are two kinds [of men] who sustain the faith and religion of CHRIST? Priests and good Senators, good clergy, good Magistracy — [some] placed on the mountain of contemplation, holy; [others] clear and shining in the brightness of holy actions? Or [are] Aaron, St. Peter, and Hur, St. Paul, the two columns of the Christian Church? For [that] both were once wont to be painted by Christians together with CHRIST — witness [is] St. Augustine (book 1 On the Consensus of the Evangelists, ch. 9). By Moses Rupert understands (book 3 On the Trinity, ch. 20) the Law, which, that it may be fulfilled, needs a sustainer — Aaron, [that is] CHRIST; Hur, [that is] the Holy Spirit.
(col. 78)
This same [thing] afterward I shall express in words. But it seems [to be] rightly [understood] — as I said above — [that] by Moses CHRIST the Lord [is] taken, to whom always stood by God the Father, and God the Holy Spirit. For, according to the flesh, he takes on the infirmities of all of us, and himself bore our languors; and the hands of the Father and of the Holy Spirit were sustaining the weakness of his body — [hands] which they never so withdrew as to let [him] fall, but only [so far] as not to turn away [his] pains and torments. And thus that forsaking, adduced above, is to be taken. Certainly, when — from the fear of most grievous torments — Christians were being compelled to desert CHRIST, St. Gregory Thaumaturgus is read to have lifted up [his] hands to heaven, as it were against the Amalekites, and to have obtained a most holy victory for very many. (Vol. 4 of Surius, p. 73.)