Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
malik:31-59Mālik > Yūnus b. Yūsuf > Saʿīd b. al-Musayyab

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."  

مالك:٣١-٥٩وَحَدَّثَنِي عَنْ مَالِكٍ عَنْ يُونُسَ بْنِ يُوسُفَ عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ

أَنَّ عُمَرَ بْنَ الْخَطَّابِ مَرَّ بِحَاطِبِ بْنِ أَبِي بَلْتَعَةَ وَهُوَ يَبِيعُ زَبِيبًا لَهُ بِالسُّوقِ فَقَالَ لَهُ عُمَرُ بْنُ الْخَطَّابِ إِمَّا أَنْ تَزِيدَ فِي السِّعْرِ وَإِمَّا أَنْ تُرْفَعَ مِنْ سُوقِنَا