Reference for Shabbat 192:8

והא דתנן הזורק ד' אמות בכותל למעלה מי' טפחים כזורק באויר למטה מי' טפחים כזורק בארץ והזורק בארץ ד' אמות חייב

We have thus found [an interdict for] carrying out: whence do we know [that] carrying in [is forbidden]? — That is common sense: consider: it is [transference] from one domain to another: what does it matter whether one carries out or carries in? Nevertheless. carrying out is a primary [labour], [whereas] carrying in is a derivative.

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