'Burden' in the Bible

Naaman said, "If not, then, please let there be given to your servant two mules' burden of earth; for your servant will from now on offer neither burnt offering nor sacrifice to other gods, but to Yahweh.

So Hazael went to meet him, and took a present with him, even of every good thing of Damascus, forty camels' burden, and came and stood before him, and said, "Your son Benhadad king of Syria has sent me to you, saying, 'Will I recover from this sickness?'"

Then Jehu said to Bidkar his captain, "Pick him up, and throw him in the plot of the field of Naboth the Jezreelite; for remember how, when you and I rode together after Ahab his father, Yahweh laid this burden on him: