Seventy. Possibly a round number. The group must not be confused with the Sanhedrin, which did not come into existence till after the Captivity. The company was seen in vision, not in actuality, and any discussion as to whether the Temple courts contained a chamber big enough to hold so large a number is therefore beside the point.
Jaazaniah. Some have attempted to identify him with “Jaazaniah the son of Azur,” one of the wicked princes mentioned in eh. 11:1. The identity cannot be established, nor can we be certain that the Shaphan here mentioned was the scribe serving under King Josiah (2 Kings 22:8, 9). If he was, the reference to him here as the ancestor of Jaazaniah might be for the purpose of showing the contrast in their characters and revealing the moral decline of the leaders.
His censer. As a climax, the 70 elders were all acting as priests, and were offering to their pictured idols the incense that none but the sons of Aaron had a right to use (2 Chron. 26:16-18) and which was to be offered only to the true God.