Jundub reported: The Prophet, peace and blessings be upon him, said, “Verily, the first organ the human being to rot is his stomach. Whoever can eat nothing but wholesome food, let him do so. Whoever can let nothing obstruct him from Paradise, even as much as a handful of bloodshed, let him do so.”
Source: Ṣaḥīḥ al-Bukhārī 7152
Grade: Sahih (authentic) according to Al-Bukhari
عن جُنْدَب عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ إِنَّ أَوَّلَ مَا يُنْتِنُ مِنْ الْإِنْسَانِ بَطْنُهُ فَمَنْ اسْتَطَاعَ أَنْ لَا يَأْكُلَ إِلَّا طَيِّبًا فَلْيَفْعَلْ وَمَنْ اسْتَطَاعَ أَنْ لَا يُحَالَ بَيْنَهُ وَبَيْنَ الْجَنَّةِ بِمِلْءِ كَفِّهِ مِنْ دَمٍ أَهْرَاقَهُ فَلْيَفْعَلْ
7152 صحيح البخاري كتاب الأحكام باب من شاق شق الله عليه