No one who is saying this today, and there are many, explains passages such as this story from Muhammad’s conquest of Khaybar: “Kinana b. al-Rabi`, who had the custody of the treasure of B. al-Nadir, was brought to the apostle who asked him about it. He denied that he knew where it was. A Jew came (T. was brought) to the apostle and said that he had seen Kinana going round a certain ruin every morning early. When the apostle said to Kinana, ‘Do you know that if we find you have it I shall kill you?’ he said Yes. The apostle gave orders that the ruin was to be excavated and some of the treasure was found. When he asked him about the rest he refused to produce it, so the apostle gave orders to al-Zubayr b. al-Awwam, ‘Torture him until you extract what he has,’ so he kindled a fire with flint and steel on his chest until he was nearly dead. Then the apostle delivered him to Muhammad b. Maslama and he struck off his head, in revenge for his brother Mahmud.” (Ibn Ishaq 515).
There is also this hadith, in which Muhammad says: “Certainly I decided to order the Mu’adh-dhin (call-maker) to pronounce Iqama and order a man to lead the prayer and then take a fire flame to burn all those who had not left their houses so far for the prayer along with their houses.” (Bukhari 1.11.626)
“Saudi King calls pilot’s killing ‘heinous’ violation of Islam,” Reuters, February 4, 2015:
Saudi King Salman bin Abdul Aziz al-Saud on Wednesday condemned the killing of a Jordanian pilot by Islamic State militants, calling it a “heinous crime which contradicts the tolerance of our noble religion,” the Saudi state news said.
His message offered condolences to the Jordanian people and King Abdullah of Jordan after footage on Tuesday purported to show masked gunmen putting captured Jordanian pilot Mouath al-Kasaesbeh in a cage and burning him to death.
Jordan and Saudi Arabia are part of the US-led alliance bombing the Islamic State group, which has seized swaths of Iraq and Syria.