Related for Megillah 53:7
ת"ש גוללין ס"ת במטפחות חומשין וחומשין במטפחות נביאים וכתובים אבל לא נביאים וכתובים במטפחות חומשין ולא חומשין במטפחות ס"ת
Come and hear: A Sefer Torah may be rolled up in the coverings of a humash, or a humash in the coverings of a scroll of prophets or writings, but prophets and writings may not be rolled up in the coverings of a humash, nor a humash in the coverings of a Sefer Torah.
Tosefta Megillah
One who fashions an ark [to house the Torah] or wrappings for a [Torah] scroll -- as long as they were not yet used for a sacred purpose, they may be used for a profane purpose, but if they had been used for a sacred purpose, they may not be used for a profane purpose. And [similarly], utensils that had been used for a sacred purpose may not be used for a profane purpose, but a person may lend his wrapping for use on a scroll, and he returns it, and he takes it from him (presumably, to use for his own purposes). A wrapping for a scroll may be changed from one scroll to another scroll, but not to anything else.
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