John Chrysostom
Then he brings forward another testimony: “Someone,” he says, “testified somewhere.” Why did he not name the prophet, but remain silent about him?
He does the same in other testimonies. For example, when he says: “And again, when He brings the Firstborn into the world, He says, ‘Let all the angels of God worship Him’” (Heb 1:6).
And again: “I will be to Him a Father” (Heb 1:5). And again: “Of the angels He says, ‘He makes His angels spirits and His ministers a flame of fire.’ But of the Son...” And, “In the beginning, O Lord, You founded the earth” (Heb 1:7, 10).
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So here too he says: “Someone somewhere testified, saying...” By the very fact that he is silent and does not name the one who gave the testimony, but brings it forward as commonly known and beyond doubt, he seems to me to show that his hearers were very well versed in the Scriptures.
See Heb 2:8.