Business Transactions
Malik :: Book 31 : Hadith 31.24.57
Yahya related to me from Malik from Yunus ibn Yusuf from Said ibn al-Musayyab that Umar ibn al-Khattab passed by Hatab ibn Abi Baltaa who was underselling some of his raisins in the market. Umar ibn al-Khattab said to him, "Either increase the price or leave our market."