Abu Dharr (RAA) narrated that the Messenger of Allah (ﷺ) said:

“Do not consider any act of goodness as being insignificant even if it is meeting your brother with a cheerful face.” Related by Muslim.

وَعَنْ أَبِي ذَرٍّ ‏- رضى الله عنه ‏- قَالَ: قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ لَا تَحْقِرَنَّ مِنْ اَلْمَعْرُوفِ شَيْئًا, وَلَوْ أَنْ تَلْقَى أَخَاكَ بِوَجْهٍ طَلْقٍ } [1]‏