Dhammapada 2 [Khuddaka Nikaya]

I- Yamakavagga, The Pairs
2- Matthakundali Vatthu

Manopubbangama dhamma, manosettha manomaya;     
manasa ce pasannena, bhasati va karoti va;    
tato nam sukha1 manveti, chayava anapayini.

All mental phenomena have mind as their forerunner; they have mind as their chief; they are mind-made. If one speaks or acts with a pure mind, happiness (sukha) follows him like a shadow that never leaves him.

Reference: 
Mya Tin, Daw, tr. The Dhammapada: Verses and Stories. Rangoon: Burma Tipitaka Association, 1986.  

Posted by Nyan U