They ask the question, if uttering a brocho unnecessarily is biblical as mentioned above, how could the chachomim institute the making of a brocho in the first place? The answer that the Torah gave the strength to the chachomim through Lo Sosur to institute takonus what they felt necessary. A kal vochamer is biblical so they can learn out a kal vochamer from bentching. The Ritva in the beginning of Pesochim says that the chachomim made a brocho on mitzvas before its performance in order the the kavonoh be realized and therefore we don’t need any special kavonoh when doing mitzvos. The Nodei Beyhudah says that for this reason a שם יחוד is unnecesssary.
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