Isaiah 36:8
Now therefore give pledges, I pray thee, to my master the king of Assyria, and I will give thee two thousand horses, if thou be able on thy part to set riders upon them. Now therefore give pledges, I pray thee, to my master the king of Assyria, and I will give thee two thousand horses, if thou be able on thy part to set riders upon them.
The verse belongs to the historical account of Assyria's invasion and threat against Judah during Hezekiah's reign. That invasion is specifically Sennacherib's invasion in Hezekiah's time. The speaker is the Assyrian envoy Rabshakeh, addressing Jerusalem through Hezekiah and his representatives. He offers to give two thousand horses if Judah on its part is able to set riders upon them. The offer is a taunt mocking Judah's military weakness, implying it lacks the riders and strength and cavalry to resist Assyria. By this challenge he belittles Judah's confidence and presses its submission to Assyria, undermining confidence in deliverance from Assyria.