Al-Kāfi - Volume 1 > The Issue of Disappearance (of the twelfth Imam (a.s.) from Public Sight
Hadith #24

24ـ عَلِيُّ بْنُ مُحَمَّدٍ عَنْ بَعْضِ أَصْحَابِنَا عَنْ أَيُّوبَ بْنِ نُوحٍ عَنْ أَبِي الْحَسَنِ الثَّالِثِ (عَلَيْهِ السَّلام) قَالَ إِذَا رُفِعَ عِلْمُكُمْ مِنْ بَيْنِ أَظْهُرِكُمْ فَتَوَقَّعُوا الْفَرَجَ مِنْ تَحْتِ أَقْدَامِكُمْ.

24. Ali ibn Muhammad has narrated from certain ones of our people from Ayyub ibn Nuh from abu a1-Hassan, the third, (a.s.) who has said the following. “When your knowledge that is with you will banish then expect glad news to emerge beneath your feet.”