The Messenger of Allah (blessings and peace
of Allah be upon him) said: “Fear the prayer of
the oppressed, even if he is a disbeliever, for
there is no barrier (between it and Allah).”
Narrated by Ahmad, 12140; classed as hasan
by al-Albaani in Saheeh at-Targheeb wa’t-
Tarheeb, 2231