Slim Whitman recorded this as did 'Somethin' Smith and 
the Redheads'

It's a sin to tell a lie


Be sure it's[G] true when you [F#]say I [G]love you
It's a sin to [B7]tell a [C]lie
[D7]Millions of hearts have been [G]broken
[A7]Just because these words were [D7]spoken

I love [G]you, yes I [F#7]do, I [G]love you
If you break my [B7]heart I'll [C]die
So be sure it's [Cm7]true when you [G]say I love [E7]you
It's a [A7]sin to [D7]tell a [G]lie

'Cross my heart and I hope to die,
'Took a little doll out on a date last night,
Next to her Gravel Gerdy woulda looked allright
I'm between the devil and the deep blue sea
'Cause I said 'Baby you look good to me'
I told her I loved her, but oh how I lied
Now she's getting set to be my blushing bride
If she leads me to the alter then I'm sunk
Cause I can't tell the preacher I was drunk
Lord have mercy on a no-account sinner
Give me one more chance to let another guy win her
Cross my heart and I hope to die
I'll never, never, never tell another white lie.