The transcription above is good, but I hear somewhat different words in this live performance by Colum Sands.
WHATEVER YOU SAY, SAY NOTHING
(Colum Sands)CHORUS:
Whatever you say, say nothing when you speak about you-know-what.
For if you-know-who should hear you, you know what you’ll get
They'll take you off to you-know-where for you-wouldn’t-know-how-long,
So for you-know-whose sake don’t let anyone hear you singing this song.Now, you all know what I’m speaking of when I mention you-know-what,
And I fear it’s very dangerous to even mention that.
For the other it is always near, although you may not see,
And if anyone asks who told you that, please don’t mention me. CHORUS.And you all know who I’m speaking of, when I mention you-know-who,
And if you-know-who could hear me now, you know what he’d do.
So if you don’t see me again, you’ll know why I’m away,
But if anyone asks you where I’ve gone, here’s what you must say: CHORUS.Well that’s enough about so-and-so, not to mention such-and-such,
I'd better end my song now, I’ve already said too much.
For the less you say and the less you hear, the less you’ll go astray,
And the less you think and the less you do, the more you’ll hear them say: CHORUS
Colum Sands live performance: https://www.youtube.com/watch?v=6Pns4Aq-RNs
Recording by Anne Feeney: https://www.youtube.com/watch?v=jjXQrSSF3Nk
Makem & Clancy: https://www.youtube.com/watch?v=Du1KIfz2bzE
I had trouble with the second stanza, and came up with
For the other ones are (other earth is??) always near, although you may not see,
I'm going to change that line to what Stewie posted below.