According to Muhammad Hashim Kamali, “Imam Malik has gone as far as to equate the amal ahl al-Madinah, that is the customary practice of the people of Madinah, with ijma’. This type of ‘amal (lit.’ practice’) constitutes a source of law in the absence of an explicit ruling in the Qur’an and Sunnah.
Ibid.,p.372.