Al-Kāfi - Volume 1 > The Issue of Disappearance (of the twelfth Imam (a.s.) from Public Sight
Hadith #18

18ـ وَبِهَذَا الاسْنَادِ عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ أَبِيهِ مُحَمَّدِ بْنِ عِيسَى عَنِ ابْنِ بُكَيْرٍ عَنْ زُرَارَةَ قَالَ سَمِعْتُ أَبَا عَبْدِ الله (عَلَيْهِ السَّلام) يَقُولُ إِنَّ لِلْقَائِمِ غَيْبَةً قَبْلَ أَنْ يَقُومَ إِنَّهُ يَخَافُ وَأَوْمَأَ بِيَدِهِ إِلَى بَطْنِهِ يَعْنِي الْقَتْلَ.

18. Through the same chain of narrators it is narrated from Ahmad ibn Muhammad from his father, Muhammad ibn ‘Isa from ibn Bukayr from Zurara who has said the following. “ Al-Qa’im (the one who will rise with Divine Authority) will disappear before he will rise with divine power. He will suffer fear. The Imam (a.s.) pointed to his midsection, meaning thereby being murdered.”