Al-Kāfi - Volume 1 > If Secrets would be kept the Imams (a.s.) can tell everyone what is for and against them
Hadith #1

1ـ عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ الْحُسَيْنِ بْنِ سَعِيدٍ عَنْ فَضَالَةَ بْنِ أَيُّوبَ عَنْ أَبَانِ بْنِ عُثْمَانَ عَنْ عَبْدِ الْوَاحِدِ بْنِ الْمُخْتَارِ قَالَ قَالَ أَبُو جَعْفَرٍ (عَلَيْهِ السَّلام) لَوْ كَانَ لالْسِنَتِكُمْ أَوْكِيَةٌ لَحَدَّثْتُ كُلَّ امْرِئٍ بِمَا لَهُ وَعَلَيْهِ.

1. A number of our people has narrated from Ahmad ibn Muhammad from al-Husayn ibn Sa‘id from Fadala ibn Ayyub from Aban ibn ‘Uthman from ‘Abd al-Wahid ibn al-Mukhtar who has that abu Ja‘far (a.s.) has said the following. “Had there been a thing (zip) to contain (to sack) your tongues I would have spoken to everyone about what is for or against him.”

Hadith #2

2ـ وَبِهَذَا الاسْنَادِ عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ ابْنِ سِنَانٍ عَنْ عَبْدِ الله بْنِ مُسْكَانَ قَالَ سَمِعْتُ أَبَا بَصِيرٍ يَقُولُ قُلْتُ لابِي عَبْدِ الله (عَلَيْهِ السَّلام) مِنْ أَيْنَ أَصَابَ أَصْحَابَ عَلِيٍّ مَا أَصَابَهُمْ مَعَ عِلْمِهِمْ بِمَنَايَاهُمْ وَبَلايَاهُمْ قَالَ فَأَجَابَنِي شِبْهَ الْمُغْضَبِ مِمَّنْ ذَلِكَ إِلا مِنْهُمْ فَقُلْتُ مَا يَمْنَعُكَ جُعِلْتُ فِدَاكَ قَالَ ذَلِكَ بَابٌ أُغْلِقَ إِلا أَنَّ الْحُسَيْنَ بْنَ عَلِيٍّ صَلَوَاتٌ عَلَيْهِمَا فَتَحَ مِنْهُ شَيْئاً يَسِيراً ثُمَّ قَالَ يَا أَبَا مُحَمَّدٍ إِنَّ أُولَئِكَ كَانَتْ عَلَى أَفْوَاهِهِمْ أَوْكِيَةٌ.

2. Through the same chain of narrators it is narrated from Ahmad ibn Muhammad from ibn Sinan from ‘Abdallah ibn Muskan who has said that he heard abu Basir say that he said to abu ‘Abdallah (a.s.) the following. “What made the supporters of Ali (a.s.) suffer the troubles despite the fact that they knew about their deaths and (causes of their) suffering?” the Imam (a.s.) replied me in a way as if he seemed angry, “from who could it come except from their own selves.?” I then asked, “What prevents you, may Allah take my soul in service for your cause, from telling it all (to your friends). The Imam (a.s.) said, “It is a door that is closed door except that al-Husayn ibn Ali (a.s.) opened it to a small degree (told a few things about future to his supporters just before their martyrdom).” The Imam (a.s.) then said, “O abu Muhammad, those people had a tie (zip) over their mouths.”