عَنْ عَبْدِ اللَّهِ بْنِ مَسْعُودٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «طَلَبُ كَسْبِ الْحَلَالِ فَرِيضَةٌ بَعْدَ الْفَرِيضَةِ» . رَوَاهُ الْبَيْهَقِيُّ فِي شعب الْإِيمَان

Rafi' b. Khadij said God's Messenger was asked what type of earning was best and replied, “A man’s work with his hand and every business transaction which is approved.”Ahmad transmitted it.