The person asking the question is talking about a brain teaser. It is probably the the one which shows the word 'swear' over bible, and resolves to 'swearing on The Bible".
Or, just possibly, "swear on a stack of bibles".
mosquito
Backwards
Big Brained (or smart)
Turkey in the straw
Pea pod.
Double or nothing
Big Brained (or smart)
It mean "clever after thought"
"Open sesame."
Scre yu
Seasons
2 rights