Musannaf Ibn Abi Shaybah 30948 — Heretics (zanadiqah): what

Abd al-Rahman bin Ubayd reports that Ubayd said: There were some people who used to take the annual and monthly stipends and pray with the people, and they also worshipped idols in secret. These people were brought to Sayyiduna Ali (may Allah be pleased with him), and he put them in the mosque, or in the prison. Then he said: "O people, what is your opinion about those who take the annual and monthly stipends with you and also worship these idols?" The people said: "Kill them." He said: "No, but I will deal with them as was done to our father Ibrahim (peace be upon him)." So he burned them in the fire.