Prophet Abraham - 14:24
Do you not see that Allah likens a good word to a beautiful tree: Its root is fixed and its branches are in the sky.
Related:
The Cow/2:263
A kind word and forbearance is better than charity which is followed by dishonorable treatment. Allah is Rich, Compassionate.
Originator/35:10
Those who desire honor, know that all honor belongs to Allah. The good word ascends to Him, and the good deed elevates Him. For those who plot evil there is a severe torment and their plans will fail.