تَبَسُّمُكَ فِي وَجْهِ أَخِيكَ لَكَ صَدَقَةٌ
“Smiling in your brother's face is an act of charity.”
—Prophet Muhammad ﷺ
source: Jami at-Tirmidhi 1956
https://sunnah.com/urn/672590
