Western Saints
Augustine of Hippo
"The Lord out of Zion bless you, who made heaven and earth" [Psalm 134:3]. He exhorts many to bless, and Himself blesses one, because He makes one out of many, since "it is good and pleasant for brethren to dwell together in one." It is a plural number, brethren, and yet singular, to dwell together in one. Let none of you say, It comes not to me. Do you know of whom he speaks, "the Lord bless you out of Zion." He blessed one. Be one, and the blessing comes to you.
Exposition on Psalm 134 ↗
Jerome
May the Lord bless you out of Sion, he who made heaven and earth. If you are holy, hear what he says, 'who made heaven': if you are a sinner, 'who made earth.' He made both heaven and earth. For the moment let us speak according to the letter. He said this to distinguish God from the idols. 'The gods,' he says, 'who have not made heaven and earth, let them perish from the earth.' 'But the Lord made the heavens.' This he says to distinguish God from the idols. This much for now according to the letter. …
Homily 46, on Psalm 133 ↗