After Naaman was healed, he returned and urged Elisha to accept a present. Elisha refused, swearing, “As the LORD lives, before whom I stand, I will receive none.” Naaman then made requests about taking earth and about pardon in his duties, and Elisha told him to go in peace (2 Kings 5:15–19).
In 2 Kings 5:15–19, Naaman returns to Elisha and publicly acknowledges Israel’s God as the only God. He offers a gift in gratitude, but Elisha refuses firmly. Naaman then asks for Israelite soil so he can worship Yahweh back home and promises exclusive devotion to Yahweh. This scene closes the healing story of Naaman that began with his disease, Israel’s captive girl pointing him to the prophet, and his initial resistance to Elisha’s simple instruction.
Naaman’s words are presented as a real shift: he now confesses that Israel’s God is the only God “in all the earth,” and he speaks as one who has been helped and is accountable to Elisha (he returns, stands before him, and addresses him as “your servant”). This is the story’s move from healing to allegiance.
A careful answer keeps the immediate passage, the book's argument, and the whole-Bible storyline together, so the question is answered in context instead of as a detached idea.
Start with 2 Kings 5:15-19, then read the surrounding section so the answer stays connected to the passage's flow.
15He returned to the man of God, he and all his company, and came, and stood before him; and he said, See now, I know that there is no God in all the earth, but in Israel: now therefore, please take a present from your servant.
16But he said, As Yahweh lives, before whom I stand, I will receive none. He urged him to take it; but he refused.
17Naaman said, If not, yet, please let there be given to your servant two mules` burden of earth; for your servant will henceforth offer neither burnt offering nor sacrifice to other gods, but to Yahweh.
18In this thing Yahweh pardon your servant: when my master goes into the house of Rimmon to worship there, and he leans on my hand, and I bow myself in the house of Rimmon, when I bow myself in the house of Rimmon, Yahweh pardon your servant in this thing.
19He said to him, Go in peace. So he departed from him a little way.