Musnad Ahmad 32:1723

Rawh narrated to us, Hisham bin Abi Abdullah narrated to us, from Qatadah, from Anas, with the like of it. He said: "And Qatadah used to mention this hadith when he was asked about this verse: 'Do not ask about things which, if they were shown to you, would distress you' [Al-Ma'idah: 101]."