Mishkat al-Masabih
Mishkat al-Masabih 4509
وَعَنِ ابْنِ عَبَّاسٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «إِنَّ أَشَدَّ النَّاسِ عَذَابًا يَوْمَ الْقِيَامَةِ مَنْ قَتَلَ نَبِيًّا أَوْ قَتَلَهُ نَبِيٌّ أَوْ قَتَلَ أَحَدَ وَالِدَيْهِ وَالْمُصَوِّرُونَ وعالم لم ينْتَفع بِعِلْمِهِ»
Unreviewed translation. All hadiths in this collection are available in five languages. Titles and introductions may remain in Arabic.
It is related from Ibn Abbas that the Messenger of Allah (may Allah bless him and grant him peace) said: “The people most severely punished on the Day of Resurrection are one who killed a prophet, one who was killed by a prophet, one who killed either of his parents, the image-makers, and a scholar who did not benefit from his knowledge.”