Chief of the Heads, one of the three officers whom Sennacherib sent from Lachish with a threatening message to Jerusalem (2 Kings 18:17; Jer. 39:3, 13).
Rabsaris
Rabsaris is a title, not a personal name, and it turns up on the lists of officers who served foreign kings. In 2 Kings 18 the king of Assyria sends Tartan, Rabsaris and Rabshakeh with a great host to Jerusalem, where they stand by the conduit of the upper pool. In Jeremiah 39 a Rabsaris is named again among the princes of Babylon who sit in the middle gate after the city falls. The verses give little more than the title and the setting. Read 2 Kings 18:17 to meet the Assyrian envoys at the walls of Jerusalem.
4 verses
2 Kings
And the king of Assyria sent Tartan and Rabsaris and Rabshakeh from Lachish to king Hezekiah with a great host against Jerusalem. And they went up and came to Jerusalem. And when they were come up, they came and stood by the conduit of the upper pool, which is in the highway of the fuller's field.
Isaiah
In the year that Tartan came unto Ashdod,(when Sargon the king of Assyria sent him,) and fought against Ashdod, and took it;
Jeremiah
And all the princes of the king of Babylon came in, and sat in the middle gate, even Nergalsharezer, Samgarnebo, Sarsechim, Rabsaris, Nergalsharezer, Rabmag, with all the residue of the princes of the king of Babylon.
So Nebuzaradan the captain of the guard sent, and Nebushasban, Rabsaris, and Nergalsharezer, Rabmag, and all the king of Babylon's princes;
From Easton's Bible Dictionary
Matthew George Easton, 1897