Hadith 8:23
‘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 .
عَنْ عَبْدِ اللَّهِ بْنِ مَسْعُودٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «طَلَبُ كَسْبِ الْحَلَالِ فَرِيضَةٌ بَعْدَ الْفَرِيضَةِ» . رَوَاهُ الْبَيْهَقِيُّ فِي شعب الْإِيمَان
Original Reference: Mishkat al-Masabih 2781