Abu Dharr Radhiallahu ‘anhu reported: The Messenger of Allah Salla Allahu ‘alayhi wa-sallam said:
لاَ تَحْقِرَنَّ مِنَ الْمَعْرُوفِ شَيْئًا وَلَوْ أَنْ تَلْقَى أَخَاكَ بِوَجْهٍ طَلْقٍ
Do not regard any good deed as insignificant, even meeting your brother with a cheerful face.
Source: Sahih Muslim
ruhaniqalb 