Two Mules Burden Of Earth

2 Kings 5:15-17 (KJV) 15 And Naaman returned to the man of God, he and all his company, and came, and stood before him: and he said, Behold, now I know that there is no God in all the earth, but in Israel: now therefore, I pray thee, take a blessing of thy servant. 16 But he said, As the LORD liveth, before whom I stand, I will receive none. And Naaman urged him to take it; but he refused. 17 And Naaman said, Shall there not then, I pray thee, be given to thy servant two mules' burden of earth? for thy servant will henceforth offer neither burnt offering nor sacrifice unto other gods, but unto the LORD.