Asahiah
Asahiah — rendered Asaiah in the UPDV — is one of the king's slaves whom Josiah commands, alongside Hilkiah the priest and Shaphan the scribe, to inquire of Yahweh after the book of the law has been recovered from the temple. He appears only in the parallel narratives of 2 Kings 22 and 2 Chronicles 34, and only at the moment of that consultation.
The Errand to Huldah
When the rediscovered book is read in Josiah's hearing, the king commissions a delegation: "the king commanded Hilkiah the priest, and Ahikam the son of Shaphan, and Achbor the son of Micaiah, and Shaphan the scribe, and Asaiah the king's slave, saying, Go⁺, inquire of Yahweh for me, and for the people, and for all Judah, concerning the words of this book that was found" (2 Ki 22:12-13). The grouping is unusual — a priest, royal officials, a scribe, and Asaiah, designated simply as "the king's slave." He is named with the others as one of those who carry the question.
The Chronicler records the same commission with one alteration in the personnel ("Abdon the son of Micah" in place of Achbor) but retains Asaiah in the same role: "Shaphan the scribe, and Asaiah the king's slave, saying, Go⁺, inquire of Yahweh for me, and for those who are left in Israel and in Judah, concerning the words of the book that was found" (2 Ch 34:20-21).
Reaching the Prophetess
The delegation goes to Huldah the prophetess, "the wife of Shallum the son of Tikvah, the son of Harhas, keeper of the wardrobe" (2 Ki 22:14). The Kings narrative names Asaiah explicitly among those who reach her: "So Hilkiah the priest, and Ahikam, and Achbor, and Shaphan, and Asaiah, went to Huldah the prophetess… and they communed with her" (2 Ki 22:14). The Chronicler condenses the list to "Hilkiah, and those whom the king [had commanded]" (2 Ch 34:22) — the bracketed insertion supplying the implied antecedent — but Asaiah is among that group by the previous verse's commissioning.
What the Errand Returns
Asaiah's part in the narrative ends with the message the delegation carries back. Huldah's word is twofold. To the place itself: "I will bring evil on this place, and on its inhabitants, even all the words of the book which the king of Judah has read… my wrath will be kindled against this place, and it will not be quenched" (2 Ki 22:16-17; cf. 2 Ch 34:24-25). To Josiah personally: "because your heart was tender, and you humbled yourself before Yahweh… I will gather you to your fathers, and you will be gathered to your grave in peace" (2 Ki 22:19-20; 2 Ch 34:27-28).
The closing line of Kings — "And they brought the king word again" (2 Ki 22:20) — and the corresponding Chronicles line — "And they brought back word to the king" (2 Ch 34:28) — are the last point at which Asaiah is in view. He carries the question out and the answer back; the text does not follow him further.