Hadith 1306
وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ عُمَرَ بْنَ عَبْدِ الْعَزِيزِ، قَضَى بِوَضْعِ الْجَائِحَةِ . قَالَ مَالِكٌ وَعَلَى ذَلِكَ الأَمْرُ عِنْدَنَا . قَالَ مَالِكٌ وَالْجَائِحَةُ الَّتِي تُوضَعُ عَنِ الْمُشْتَرِي الثُّلُثُ فَصَاعِدًا وَلاَ يَكُونُ مَا دُونَ ذَلِكَ جَائِحَةً .
Yahya related to me from Malik that he had heard that Umar ibn Abd al-Aziz decided in a case to make a reduction for crop damage. Malik said, "That is what we do in the situation." Malik added, "Crop damage is whatever causes loss of a third or more for the purchaser. Anything less is not counted as crop damage
Maqtu Daif (Salim al-Hilali)
Muwatta Malik 1306 · Book 31, Hadith 17