A good word is charity

A kind word is charity.

Narrated by Abu Hurairah

A good word is charity.

Sahih al-Bukhari 2989, Sahih Muslim 1009

What this hadith teaches

Speaking kindly costs nothing and is written as charity.

Reference and grade

Grade
Sahih: agreed upon by al-Bukhari and Muslim
Narrator
Abu Hurairah

The hadith in Arabic نص الحديث

كُلُّ سُلاَمَى مِنَ النَّاسِ عَلَيْهِ صَدَقَةٌ كُلَّ يَوْمٍ تَطْلُعُ فِيهِ الشَّمْسُ، يَعْدِلُ بَيْنَ الاِثْنَيْنِ صَدَقَةٌ، وَيُعِينُ الرَّجُلَ عَلَى دَابَّتِهِ، فَيَحْمِلُ عَلَيْهَا، أَوْ يَرْفَعُ عَلَيْهَا مَتَاعَهُ صَدَقَةٌ، وَالْكَلِمَةُ الطَّيِّبَةُ صَدَقَةٌ، وَكُلُّ خَطْوَةٍ يَخْطُوهَا إِلَى الصَّلاَةِ صَدَقَةٌ، وَيُمِيطُ الأَذَى عَنِ الطَّرِيقِ صَدَقَةٌ

Arabic text of Sahih al-Bukhari 2989, as given on sunnah.com.