הלכה אויף במדבר 10:35

One who writes a letter twice and it is a word – such as dad (breast), tat (below), gag (roof), rar (flow), sas (rejoiced), sas (a moth) and chach (hook) – is liable. And one who writes in any script and in any language is liable, and [likewise] even for two signs.

We should save a Torah scroll [that is worn] from a fire, if there is enough in it to compile eighty-five letters within complete words—even if [an Aramaic phrase like] yegar sahaduta (Genesis 31:47) is among them. Likewise, if there is a section that does not contain eighty-five letters but contains mentions [of God's name], such as (Numbers 10:35), "And it was when the Ark traveled, [etc.]"—we should save them from a fire. And we should save the scroll's receptacle with the scroll, and the tefillin's receptacle with the tefillin—even though there are [also] coins in it.