Question: what is jazakum allahu khairan?
Answer: Jazakallah (Arabic: جَزَاكَ ٱللَّٰهُ‎, jazāka -llāh) or Jazāk Allāhu Khayran (جَزَاكَ ٱللَّٰهُ خَيْرًا‎, jazāka -llāhu khayran) is a term used as an Islamic expression of gratitude meaning "May God reward you [with] goodness." The phrase Jazak Allah itself is incomplete.