Removing Gd's Name from a Sefer Torah

Hi,

If a sefer torah should have had the word יהיה, but the scribe erroneously substituted a ו for the second י, so that it was actually the Name of Gd, then one cannot alter the word itself, because it may be considered a valid recording of the Name of Gd, which cannot be erased. Therefore, one ought to cut that word from the sefer torah [and put it in genizah], and replace it with a new piece of parchment on which יהיה is written.

Ideally, one should remove the Name of Gd with the two adjacent words, since they enjoy some extra sanctity due to their location beside the Name of Gd. However, where the passage was טמא יהיה, so that leaving the word טמא [impure] next to Gd's Name would make a blasphemous declaration, then one should not do this.

(Rav Moshe Feinstein, Igrot Moshe Yoreh Deah 1:170)

Have a great day,
Mordechai