Mishkat al-Masabih 22 Clothing كتاب اللباس 196

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»

Ibn ‘Abbas reported God’s messenger as saying, ‘The one who receives the severest punishment on the day of resurrection will be he who kills a prophet, or who is killed by a prophet, or kills one of his parents, those who make representations of things, and a learned man who derives no benefit from his learning.” Baihaqi transmitted it in Shu’ab al-iman .