Quoting%20commentary for Demai 4:5

הָאוֹמֵר לְמִי שֶׁאֵינוֹ נֶאֱמָן עַל הַמַּעַשְׂרוֹת, קַח לִי מִמִּי שֶׁהוּא נֶאֱמָן וּמִמִּי שֶׁהוּא מְעַשֵּׂר, אֵינוֹ נֶאֱמָן. מֵאִישׁ פְּלוֹנִי, הֲרֵי זֶה נֶאֱמָן. הָלַךְ לִקַּח מִמֶּנּוּ, וְאָמַר לוֹ לֹא מְצָאתִיו וְלָקַחְתִּי לְךָ מֵאַחֵר שֶׁהוּא נֶאֱמָן, אֵינוֹ נֶאֱמָן:

If one says to someone who is not trustworthy regarding tithes, "Buy [produce] for me from one who is trusted or from one who tithes," he [the messenger] is not trusted. [If one says,] "From so-and-so person," this [the messenger] is trusted. If he went to buy from him [the specified person], but said to him [the sender], "I could not find him and I bought for you from someone else who is trusted," he [the messenger] is not trusted.

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