Chapter III Sloka 19

tSmads­> stt< kay¡ kmR smacr,
AsKtae ýacrNkmR prmaßaeit pUé;>.

tasm˜dasakta× satataÕ 
k˜ryaÕ karma sam˜cara | 
asakto hy˜carankarma 
param˜pnoti p¨ruÿa× ( 3|19)||


Therefore, without attachment
do thou always perform action which should be done;
for by performing action without attachment
man reaches the Supreme.