Al-Kāfi - Volume 1 > Setting-up a Time Limit for the Reappearance of the Twelfth Imam (a.s.) an Antipathetic Issue
Hadith #2

2ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ سَلَمَةَ بْنِ الْخَطَّابِ عَنْ عَلِيِّ بْنِ حَسَّانَ عَنْ عَبْدِ الرَّحْمَنِ بْنِ كَثِيرٍ قَالَ كُنْتُ عِنْدَ أَبِي عَبْدِ الله (عَلَيْهِ السَّلام) إِذْ دَخَلَ عَلَيْهِ مِهْزَمٌ فَقَالَ لَهُ جُعِلْتُ فِدَاكَ أَخْبِرْنِي عَنْ هَذَا الامْرِ الَّذِي نَنْتَظِرُ مَتَى هُوَ فَقَالَ يَا مِهْزَمُ كَذَبَ الْوَقَّاتُونَ وَهَلَكَ الْمُسْتَعْجِلُونَ وَنَجَا الْمُسَلِّمُونَ.

2. Muhammad ibn Yahya has narrated from Salma ibn al-Khattab from Ali ibn Hassa’n from ‘Abd al-Rahman ibn al-Kathir who has said the following. “Once I was in the presence of abu ‘Abdallah (a.s.) that Mihzam came in and to The Imam (a.s.), ‘May Allah take my soul in service for your cause, enlighten me about this matter that we wait for (the rise of al-Mahdi with Divine authoriiity). When it will take place?” The Imam (a.s.) said, “O Mihzam, those who give it d definite time have lied, the expediting ones perish and salvation is for those who are submissive.”