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In page Al-Sahifa al-Sajjadiyya:

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Shia narrations state that Sajjad composed al-Sahifa al-Sajjadiyya after the Battle of Karbala (680 AD). Shia narrations state Imam Sajjad therefore used rich and meaningful supplications to reconstruct society and distribute Islamic knowledge.[3] It seems al-Sahifa al-Sajjadiyya – which was protected from government agents by Imam Sajjad’s sons and companions – was a sectarian and organisational booklet, which the access of the government agents to it make ineffective all Imam Sajjad's efforts.[4]