Boo hoo caught in a dilema...

Found myself caught in a difficult situation...

My immediate boss came to tell me tat there was something tat i missed out when i was helping another person to double check their work... But the thing is i didn noe that the thing i missed out must be checked as well... Haiz... Den i did not clarify immediately that i was not told to checked...

N apparently another colleague of mine who is doing the same task was not told to check it as well...

Now the question is whether i should go by heart(not to get another colleague into trouble or worst cause dispute among them) or by mind (telling my immediate boss what happened)... Haiz...

:-(