John Gills Exposition of the Bible Commentary - Isaiah 16:1
Send ye the lamb to the ruler of the land ,.... Or tribute, as the Targum rightly interprets it. The Moabites, being conquered by David, paid tribute to him, 2 Samuel 8:2 and when the kingdom was divided in Rehoboam's time, the tribute was paid to the kings of Israel, which continued till the times of Ahab, when the Moabites rebelled, and refused to pay it, 2 Kings 3:4 and this tribute, as appears from the passage now referred to, was paid in lambs and rams; which now they are bid to pay... read more
Matthew Henry's Complete Commentary - Isaiah 16:1-5
God has made it to appear that he delights not in the ruin of sinners by telling them what they may do to prevent the ruin; so he does here to Moab. I. He advises them to be just to the house of David, and to pay the tribute they had formerly covenanted to pay to the kings of his line (Isa. 16:1): Send you the lamb to the ruler of the land. David made the Moabites tributaries to him, 2 Sam. 8:2. They became his servants, and brought gifts. Afterwards they paid their tribute to the kings of... read more