A good word is charity
وَالْكَلِمَةُ الطَّيِّبَةُ صَدَقَةٌ
Wa-l-kalimatu-t-tayyibatu sadaqah.
"A good word is charity."
Narrated by Abu Hurayrah. Sahih al-Bukhari 2989, Sahih Muslim 1009
A short reflection
The cheapest sadaqah you can give, and the most repeatable. Give it often.