Here Naaman is referred to by his hands to emphasize the act of giving. Alternate translation: "from him" (See: [[rc://en/ta/man/translate/figs-synecdoche]])
"As surely as Yahweh lives." Here Gehazi compares the certainty that Yahweh is alive to the certainty of what he has decided to do. This is a way of making a solemn promise. Alternate translation: "As Yahweh lives, I promise" (See: [[rc://en/ta/man/translate/figs-simile]])