Mincha: stopping in the middle of the day
The Gemara teaches that each of the Avos established one of the daily tefillos, and that Yitzchak established Mincha. The Torah says he went out to the field "to converse" toward evening, and Chazal explain that conversation here means tefillah, as in the verse "a prayer of the afflicted, when he pours out his speech before Hashem." Yitzchak did not wait for the quiet of morning or night. He stopped in the open field, in the middle of the working day, and turned to Hashem. Mincha, davened while the day's business is still going on, carries that lesson every afternoon.
Source: Berachos 26b; Bereishis 24:63, Rashi
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