Al-Kāfi - Volume 5 > Continuing Profitable Businesses
Hadith #3

3- عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ ابْنِ فَضَّالٍ عَنْ عَلِيِّ بْنِ شَجَرَةَ عَنْ بَشِيرٍ النَّبَّالِ عَنْ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) قَالَ إِذَا رُزِقْتَ فِي شَيْ‏ءٍ فَالْزَمْهُ.

3. A number of our people have narrated from Ahmad ibn Muhammad from ibn Faddal from Ali ibn Shajarah from Bashir al-Nabbal who has said the following: “Abu ‘Abd Allah, ‘Alayhi al-Salam, has said, ‘When you (in a business) find sustenance in a certain item then you must continue with it.”