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.”
Ibn ‘Abbas was asked about payment for writing a copy of the Qur’an and replied, “There is no harm. They are just people who draw figures and get a living simply by their handiwork.”
Abu Bakr b. Aba Maryam said that Miqdam b. Ma'dikarib had a slave girl who sold milk the price of which was taken by Miqdam. Some people said, “Glory be to God! Do you sell milk and accept what is paid for it?” He replied that he did, and asked what harm there was in that, for he had heard God’s Messenger say, “A time is certainly coming to mankind when only the dinar and the dirham will be of use.”
‘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.”