UmpTT,
I presume you meant to say a "BR to retreat towards Home Plate", rather than 1B?
If so, it's in the MLBUM (nothing is said on the subject in the text of the rules themselves).
Quote:
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NOTE: In situations where the batter-runner gets in a rundown between first and home, if the batter-runner retreats and reaches home plate, he shall be declared out.
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JM
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Finally, be courteous, impartial and firm, and so compel respect from all.
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