Maliks Muwatta Book 41, Hadith Number 29.

Yahya related to me from Malik from Rabia ibn Abi Abd ar-Rahman that az-Zubayr ibn al-Awwam came across a man who had taken hold of a thief and was intending to take him to the Sultan. Az-Zubayr ibn al-Awwam interceded for him to let him go. He said, “No. Not until I take him to the Sultan.” Az-Zubayr said, “When you reach the Sultan with him, Allah curses the one who intercedes and the one who accepts the intercession.”