Reference for Menachot 60:5

ולימא מר הלכה כמר ומר הלכה כמר משום דאפכי להו

R'Simeon B'Eleazar says in the name of R'Meir, He may write the Name neither upon an erasure nor upon a word that has been wiped away, neither may he insert it above the line. What must he do then?

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