When they finished supplicating, the priests sang praise and thanks to The Lord.
It was when the sacrifice was consumed, Nehemiah commanded [them] to spill the remaining water on the floor, a flame burned and the fire from on the altar swallowed it.
It was told to the king of Persia that water was found in the place that the exiled priests hid the fire, and that fire burned a sacrifice that Nehemiah offered. He searched and investigated to see if it was true.
He found that it was true and correct. He sanctified the place and fenced it off, and he gave expensive gifts to all who found favor in his eyes.