# This people comes close to me with their mouths and honors me with their lips

"The people of Jerusalem pretend to worship me and honor me with what they say" 

# but their heart is far from me

"but they do not honor me in their thoughts" or "but they are not truly devoted to me" 

# Their honor for me is only a commandment of men that has been taught

"They honor me only because that is what people tell them to do"