What is the meaning of John 12:38?

* The two F.O.G. Bibles & Commentary below are currently a work in progress.

This was to fulfill the word of Isaiah the prophet: “Lord, who has believed our message? And to whom has the arm of the Lord been revealed?”

Berean Standard Bible (BSB)

that the word of Isaiah the prophet might be fulfilled, which he spoke, “Lord, who has believed our report? To whom has the arm of the Lord been revealed?”

World English Bible (WEB)

That{G2443} the saying{G3056} of Esaias{G2268} the prophet{G4396} might be fulfilled{G4137}{(G5686)}, which{G3739} he spake{G2036}{(G5627)}, Lord{G2962}, who{G5101} hath believed{G4100}{(G5656)} our{G2257} report{G189}? and{G2532} to whom{G5101} hath the arm{G1023} of the Lord{G2962} been revealed{G601}{(G5681)}?

Strong's King James

(38) In order to complete the word of Isaiah the prophet which said, "יהוה YAHWEH who believed our report? To whom has יהוה YAHWEH's arm been revealed?"

The F.O.G*

[38] This fulfilled Isaiah's prophecy: "Lord, who has believed our message? To whom has the Lord revealed His powerful arm?"

The F.O.G Paraphrase

that the word of Isaiah the prophet might be fulfilled, which he said, ‘Lord, who gave credence to our report? and the arm of the Lord—to whom was it revealed?’

Young's Literal Translation