But with righteousness shall he judge the poor, and decide with equity for the meek of the earth: and he shall strike the earth with the rod of his mouth, and with the breath of his lips shall he slay the wicked.
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Hence, when Isaiah said “he will judge the poor with justice,” he was without doubt speaking of those very persons to whom it was said, “Blessed are you poor, for yours is the kingdom of God.” - "Four Books on 1 Samuel 1.7.6"
That the Holy Spirit also proceeds from the Son, the prophetic and apostolic teaching shows us. So Isaiah says concerning the Son, “He shall strike the earth with the rod of his mouth, and with the breath of his lips he shall kill the wicked.” Concerning him the apostle also says, “Whom the Lord Jesus will kill with the breath of his mouth.” The one Son of God himself, showing who the Spirit of his mouth is, after his resurrection, breathing on his disciples, says, “Receive the Holy Spirit.” “From the mouth,” indeed, of the Lord Jesus himself, says John in the Apocalypse, “a sharp, two-edged word came forth.” The very Spirit of his mouth is the sword itself that comes forth from his mouth. - "To Peter on the Faith 54"
And Paul, speaking of Antichrist to the Thessalonians, says, “Whom the Lord Jesus will slay by the breath of his mouth.” And Isaiah says, “By the breath of his lips he shall slay the wicked.” This, therefore, is the two-edged sword issuing out of his mouth. - "Commentary on the Apocalypse 1.14"