One who has eaten a morsel of Ḥarām
"The saying of the Beloved Prophet صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم ‘One who has eaten a morsel of Ḥarām, his Ṣalāĥ for 40 days will not be accepted, and his Du’ā will remain unaccepted for 40 days. (Al-Firdaus bimā Šaur-ul-Khaṭṭāb, vol. 3, pp. 591, Ḥadīš 5853) "