إِنَّا لَنَنصُرُ رُسُلَنَا وَٱلَّذِينَ ءَامَنُواْ فِى ٱلۡحَيَوٰةِ ٱلدُّنۡيَا وَيَوۡمَ يَقُومُ ٱلۡأَشۡهَـٰدُ (٤٠:٥١)

Lo! We verily do help Our messengers, and those who believe, in the life of the world and on the day when the witnesses arise (40:51).

Correlating Hadith

Imam al-Baqir said, “[Imam] Hussain bin Ali is among those described in this verse who has yet to be helped! I swear to Allah that the killers of Hussain were killed, but his blood has not yet been avenged."

الباقر (علیه السلام)- الْحُسَیْنُ‌ بْنُ‌عَلِیٍّ (علیه السلام) مِنْهُمْ وَ لَمْ یُنْصَرْ بَعْدُ ثُمَّ قَالَ وَ اللَّهِ لَقَدْ قُتِلَ قَتَلَهًُْ الْحُسَیْنِ (علیه السلام) وَ لَمْ یُطْلَبْ بِدَمِهِ بَعْدُ

Sources

Kamil al-Ziyarat, ch. 18, pg. 82; Bihar al-Anwar, vol. 45, pg. 297.

تفسیر اهل بیت علیهم السلام ج13، ص428 /بحارالأنوار، ج45، ص298/ کامل الزیارات، ص63/ البرهان