Jami` at-Tirmidhi Book 47, Hadith 380
The Messenger of Allah said regarding this Ayah: “He is the One deserving of the Taqwa, and He is the One Who forgives. – he said: ‘Allah, Blessed is He and Most High, said: “I am the most worthy to have Taqwa of, so whoever has Taqwa of Me, not having any god besides Me, then I am most worthy that I forgive him.”
“Some people from the Jews said to some people among the Companions of the Prophet: ‘Does your Prophet know how many keepers are there in Jahannam?’ They said: ‘We do not know until we ask our Prophet and said: ‘O Muhammad! Your Companions were defeated today.’ He said: ‘In what were they defeated?’ He said: ‘Some Jews asked them if their Prophet knew how many keepers are there in Jahannam.’ He said: ‘So what did they say?’ He said: ‘They said: “We do not know until we ask our Prophet.” He said: ‘Are a people defeated who are asked about something that they do not know, merely because they said, “We do not know until we ask our Prophet?” Rather, there (people) did ask their Prophet, they said: “Show us Allah plainly.” I should ask the enemies of Allah about the Darmak.’ So when they came to him they said: ‘O Abul-Qasim! How many keepers are there in Jahannum?’ He said: ‘This and that many.’ One time ten, and one time nine. They said: ‘Yes.’ He said to them: ‘What is the dirt of Paradise?’” He said: “They were silent for a while, then they said: ‘Is it bread O Abul-Qasim?’ So the Prophet said: ‘The bread is made of Ad-Darmak.’”
“When the Quran was being revealed to the Messenger of Allah, he would move his tongue in attempt to memorize it. So Allah, Blessed is He and Most High, revealed: Move not your tongue concerning it to make haste therewith.” He said: “So he would move his two lips.” And Sufyan (a sub-narrator) would move his two lips.