Muwatta Malik 1804

وَحَدَّثَنِي مَالِكٌ، أَنَّهُ بَلَغَهُ أَنَّ عُمَرَ بْنَ الْخَطَّابِ، كَانَ يَذْهَبُ إِلَى الْعَوَالِي كُلَّ يَوْمِ سَبْتٍ فَإِذَا وَجَدَ عَبْدًا فِي عَمَلٍ لاَ يُطِيقُهُ وَضَعَ عَنْهُ مِنْهُ ‏.‏

Malik related to me that he heard that Umar ibn al-Khattab went to the villages every Saturday. If he found a slave doing work which he was not capable of doing, he lightened it for him

Reference

Muwatta Malik 1804

In-book

Book 54, Hadith 42