The Taz
(Y.D. 242 : 13) writes “ it is not
necessary to stand up when the
Aron Hakodesh is opened. People who do so, do it for the
Kavod of the Sifrei Torah."
The Chasam
Sofer (Ch.M. 73) writes , "Someone who is suspect of
swearing false oaths, in order to scare him, we may not force him
to lay down in a casket and make the Shevua (oath).
One of
the reasons is because, he needs to stand while the Aron
Hakodesh is open*.
*They
used to open the Aron Hakodesh and light black candles,
to
scare them, as not to make a false oath.
