وَعَنْ أَبِي ذَرٍّ رضى الله عنه
قَالَ: قَالَ رَسُولُ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ -«لَا تَحْقِرَنَّ مِنْ اَلْمَعْرُوفِ شَيْئًا، وَلَوْ أَنْ تَلْقَى أَخَاكَ بِوَجْهٍ طَلْقٍ» 11 صحيح
“Do not consider any act of goodness as being insignificant even if it is meeting your brother with a cheerful face.” Related by Muslim.
Bulugh al-Maram 1661, Book 16, The Comprehensive Book, Hadith 27. 1 min read