Al-Kāfi - Volume 1 > The Issue of Disappearance (of the twelfth Imam (a.s.) from Public Sight
Hadith #19

19ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ مُحَمَّدِ بْنِ الْحُسَيْنِ عَنِ ابْنِ مَحْبُوبٍ عَنْ إِسْحَاقَ بْنِ عَمَّارٍ قَالَ قَالَ أَبُو عَبْدِ الله (عَلَيْهِ السَّلام) لِلْقَائِمِ غَيْبَتَانِ إِحْدَاهُمَا قَصِيرَةٌ وَالاخْرَى طَوِيلَةٌ الْغَيْبَةُ الاولَى لا يَعْلَمُ بِمَكَانِهِ فِيهَا إِلا خَاصَّةُ شِيعَتِهِ وَالاخْرَى لا يَعْلَمُ بِمَكَانِهِ فِيهَا إِلا خَاصَّةُ مَوَالِيهِ.

19. Muhammad ibn Yahya has narrated from Muhammad ibn al-Husayn from ibn Mahbub from Ishaq ibn ‘Ammar who has said the following. “Abu ‘Abdallah (a.s.) has said, Al-Qa’im ((the one who will rise with Divine Authority) will have two disappearances. One of them will be for a short time and the other for a longer time. No one would know his place during the shorter disappearance except the special persons from his Shi‘a. During his longer disappearance no one will see him except very special persons from his friends.”