Reference for Shabbat 247:14

וכי תימא שבת גופיה תישתרי דהא דבר שמלאכתו לאיסור לצורך גופו ולצורך מקומו שרי הני מילי היכא דאיכא תורת כלי עליו היכא דליכא תורת כלי עליו לא

but not when its place is required. Whereupon R. Nehemiah comes to say that even an article whose function is for a permitted purpose [may be handled] only when required itself, but not when its place [alone] is required. Said Raba to him: If its place is required — do you call it: NOT REQUIRED! Rather said Raba: REQUIRED: an article whose function is for a permitted purpose [may be handled] whether required itself or its place is required: NOT REQUIRED [means] even from the sun to the shade; whilst an article whose function is for a forbidden purpose [may be moved] only when required itself or its place is required but not from the sun to the shade. Whereupon R. Nehemiah comes to say that even an article whose function is for a permitted purpose [may be moved] only when required itself or its place is required — but not from the sun to the shade.

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