The original Scottish song is lacking in the DT.
Scottish versions are available in Olson: Scarce Songs 2 Index

Olson gives this one from a broadside ca. 1770:

Lyr. Add: GOOD NIGHT, AND GOD BE WITH YOU ALL:
or, The Neighbor's Farewell to his Friends.

Now come is my departing time,
And here I may no longer stay,
There is no kind comrade of mine
But will desire I was away.
But if that time will me permit,
Which from your Company doth call,
And me inforceth for to flit,
Good Night, and God be with you all.

For here I grant some time I spent
In loving kind good Company;
For all offences I repent,
And wisheth now forgiven to be;
What I have done, for want of wit,
To Memory I'll not recall:
I hope you are my Friends as yet
Good Night, and God be with you all.

Complementing I never lov'd,
Nor talkative much for to be,
And of speeches a multitude
Becomes no man of quality;
From Faith, Love, Peace and Unity,
I wish none of us ever fall;
God grant us all prosperity:
Good Night, and God be with you all.

I wish that I might longer stay,
To enjoy your Society;
Yhe Lord to bless you night and day,
And still be in your Company.
To vice, nor to inequity,
God grant none of you ever fall,
God's blessing keep you both and me!
Good Night and God be with you all.

The Friends Reply

Most loving friend, God be thy guide,
And never leave thy Company,
And all things needful thee provide,
And give thee all prosperity;
We rather had thy Company,
If thou woulds't have stayed us among;
We wish you much felicity:
God grant that nothing doe thee wrong.

From Herd's "Scots Songs" (also copied from Olson)

O this is my departing time!
For here nae langer maun I stay;
There's not a friend or foe of mine
But wishes that I were away.

What I hae done for lack o' wit,
I never can recal!
I hope you're a' my friends as yet:
Good-night and joy be wi' you a'

Olson also gives the Irish version.