Musannaf Ibn Abi Shaybah

Hazrat Raja bin Haywah narrates that Hazrat Abu Darda said: Beware of the supplication of the oppressed, for his supplication rises towards the sky like sparks of fire, until the gates of the heavens are opened for it.

It is narrated from Hazrat Muadh bin Jabal that the Holy Prophet (peace and blessings be upon him) said: Beware of the supplication of the oppressed, for there is no barrier between it and Allah.

Hazrat Abu Saeed narrates a marfu’ hadith that you should beware of the supplications (curses) of the oppressed.

It is narrated from Hazrat Ma'n that Hazrat Awn ibn Abdullah said: There are four things that are not hidden from Allah: the supplication of a pleased parent, the supplication of a just leader, the supplication (curse) of the oppressed, and a person's supplication for his brother in his absence.

Hazrat Abu Huraira narrates that the Messenger of Allah, peace and blessings be upon him, said: The supplication of the oppressed is accepted; if he is sinful, then his sin is a burden upon himself.

It is narrated from Hazrat Ibn al-Hubna that Hazrat Ali (may Allah be pleased with him) said: There are three persons whose supplication is not rejected; the ruler who is just towards his subjects, the supplication of a father for his son, and the supplication of the oppressed against the oppressor.

It is narrated from Hazrat Abdur Rahman bin Hilal that Hazrat Abu Darda said: Beware of the supplication of the oppressed.

It is narrated from Hazrat Abdullah bin Salamah that a person came to Hazrat Mu'adh and said: Please give me some advice. So he said: Beware of the supplication of the oppressed.