[Avodah] Lesheim Yichud Source Please and explanation

[Ben Waxman]

One other point which is relevant: the Noda b'Yehuda wrote that the 
appearance of this phrase in siddurim was a new phenomena in his day. So 
while the source may be much older, according to this source it was never 
said until fairly recently.

Ben

> From: Micha Berger <micha at aishdas.org>
> >
> BTW, the Noda biYhudah was vociferously against saying "Lesheim Yichud"
> (YD 93).