Abu Malik al-Ash‘ari reported God’s Messenger as saying, “In paradise there are rooms the outside of which can be seen from within and the inside from without which God has prepared for those who speak gently, provide food, observe frequent fasting, and pray during the night when people are asleep.”
Baihaqi transmitted it in Shu'ab al-iman and Tirmidhi transmitted something similar from ‘Ali. In his version it says “for those who speak pleasantly.”