The Prophet said in his narration of a dream that he saw, "He whose head was being crushed with a stone was one who learnt the Quran but never acted o

SAHIH BUKHARI, BOOK 21 Prayer at Night (Tahajjud)
Volume 2, Book 21, Number 244:
Narrated Samura bin Jundab:

The Prophet said in his narration of a dream that he saw, "He whose head was being crushed with a stone was one who learnt the Quran but never acted on it, and slept ignoring the compulsory prayers."