Matthew Poole and continuators on Acts 5:17

17 ¶ Then the high priest rose up, and all they that were with him, which is the sect of the Sadduces and were filled with indignation,

Moved at the report of these things, went out of the Council to observe what was done.

There were both Pharises and Sadduces in their Sanhedrim or great Council, as appears Acts 23.6. but the High Priest and a great part, were at this time Sadduces.

Or zeal, which is the best, when kindled (as the fire on the Altar) from Heaven, regularly acting for Gods truth and word; and the worst, when enflamed by carnal affections, and set upon wrong objects for self ends. The pick these Sadduces had against the Apostles and their Doctrine, was, because they taught the Resurrection, which the Sadduces denied.

Marginal references: Or, Envy.