Smiddy Matthew 5:33-37 was used to support that belief ,particulary vs 37 which states
" just let your word yes mean yes your no no for what is in excess of these is from the wicked one "
Definatley Smiddy, in theUK 70s to 80s we were taught this very thing..no swearing or oaths period and definitely not on the bible..Blondie's quote is from 2003.. Tota!l about face from the GB