مَنْ كَانَ يُؤْمِنُ بِاللَّهِ وَالْيَوْمِ الْآخِرِ فَلْيَقُلْ خَيْرًا أَوْ لِيَصْمُتْ
Man kāna yuʾminu billāhi wal-yawmil-ākhir falyakul khayran aw liyasmut.
Whoever believes in Allah and the Last Day should speak good or remain silent.
تَبَسُّمُكَ فِي وَجْهِ أَخِيكَ لَكَ صَدَقَةٌ
Tabas-sūmuka fī wajhi akhīka laka ṣadaqah.
Your smile for your brother is an act of charity.
Ref: Jami‘ at-Tirmidhi, 1956