Allah's Apostle ﷺ said to me: Don't consider anything insignificant out of good things even if it is that you meet your brother with a cheerful countenance.  

لِيَ النَّبِيُّ ﷺ لاَ تَحْقِرَنَّ مِنَ الْمَعْرُوفِ شَيْئًا وَلَوْ أَنْ تَلْقَى أَخَاكَ بِوَجْهٍ طَلْقٍ  

[Machine] The Messenger of Allah ﷺ said, "Do not underestimate any act of kindness, even if it is just meeting your brother with a cheerful face. And when you cook soup, add more water to it and share it with your neighbors."  

قَالَ رَسُولُ اللَّهِ ﷺ «لَا تَحْقِرَنَّ مِنَ الْمَعْرُوفِ شَيْئًا وَلَوْ أَنْ تَلْقَى أَخَاكَ بِوَجْهٍ طَلْقٍ فَإِذَا صَنَعْتَ مَرَقَةً فَأَكْثِرْ مَاءَهَا وَاغْرِفْ لِجِيرَانِكَ مِنْهَا»  

"لا تَحْقِرَنَّ مِنَ المعروف شَيئًا وَلَوْ أنْ تلقَى أخَاكَ بِوَجْهٍ طَلقٍ".