When the Astrologer Came to ʿAlī
Imām Ibn Taimiyyah, may Allāh have mercy on him, said:
When ʿAlī, may Allāh be pleased with him, wanted to head out on a journey to fight the Khawārij, an astrologer showed up before him and said, “O Emir of the Believers, don’t go out on [this] journey, because indeed the moon is in Scorpio, and if you were to travel while the moon were in Scorpio, those who were with you would be overcome and defeated,” or however he said it.
ʿAlī then said, “Rather, we’re going to travel, trusting in Allāh, relying upon Allāh, and not believing you [and your lies].”
So he set out on [that] journey and was so blessed in [it], that he ended up killing the broad mass of the Khawārij.
Al-Fatāwá Al-Kubrá, vol. 1, p. 67.