مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 2781
Business Transactions
Earning, and Seeking what is Lawful - Section 3
عَنْ عَبْدِ اللَّهِ بْنِ مَسْعُودٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «طَلَبُ كَسْبِ الْحَلَالِ فَرِيضَةٌ بَعْدَ الْفَرِيضَةِ» . رَوَاهُ الْبَيْهَقِيُّ فِي شعب الْإِيمَان
‘Abdallah b. Mas'ud reported God's Messenger as saying, “Trying to earn a lawful livelihood is an obligatory duty in addition to the duties which are obligatory.” Baihaqi transmitted it in Shu’ab al-iman.
Mishkat al-Masabih, 2781ضَعِيف (الألباني)