Replacing a sefer torah

Hi,

Sometimes halachah requires that a sefer torah be replaced mid-reading. If this happens on a Shabbat when multiple sifrei torah have been removed for reading, one should not take the replacement torah from one of those that were initially removed for reading. Each is designated for its own mitzvah.

(Pri Megadim Orach Chaim 143 Eishel Avraham 9 אם)

Have a great day,
Mordechai