The claimant must produce the evidence/the onus of proof is on the claimant
The one who brings his friend to court is also the one who is required to prove his case by evidence. The burden of proof is placed on the plaintiff, and the defendant is only required to respond to the evidence and accusations ("the one who takes out of his friend" means someone who comes to take out property or money from his friend).
("Rava said: If they knew that someone ate something sweet, they would pay for it as if it were sweet. If they did not know, they would pay for it as if it were sweet. Now, when they did not know, they would pay for it as if it were sweet.)? The one who takes it from his friend is the one who has the view!" - Gettin Moach ab)
Translation
Expression (Hebrew)
הַמּוֹצִיא מֵחֲבֵרוֹ עָלָיו הָרְאָיָה
Definition (Hebrew)
זֶה שֶׁתּוֹבֵעַ אֶת חֲבֵרוֹ לַמִּשְׁפָּט הוּא זֶה שֶׁגַּם צָרִיךְ לְהוֹכִיחַ בִּרְאָיוֹת אֶת דְּבָרָיו. 'נֵטֶל הָרְאָיָה' מֻטָּל עַל הַתּוֹבֵעַ וְהַנִּתְבָּע צָרִיךְ רַק לְהָשִׁיב כְּנֶגֶד הָעֵדוּיוֹת וְהַטְּעָנוֹת ("הַמּוֹצִיא מֵחֲבֵרוֹ" מַשְׁמָע מִי שֶׁבָּא לְהוֹצִיא נֶכֶס אוֹ כֶּסֶף מִיְּדֵי חֲבֵרוֹ).
("אָמַר רָבָא: אִלּוּ יָדְעִינַן דִּכְחוּשָׁה אָכַל מְשַׁלֵּם כְּחוּשָׁה, הַשְׁתָּא דְּלָא יָדְעִינַן מְשַׁלֵּם שְׁמֵנָה (אִלּוּ יָדַעְנוּ שֶׁאָכַל כְּחוּשָׁה, מְשַׁלֵּם עֲבוּר כְּחוּשָׁה. עַכְשָׁו כְּשֶׁלֹּא יוֹדְעִים מְשַׁלֵּם עַל שְׁמֵנָה)? הַמּוֹצִיא מֵחֲבֵרוֹ עָלָיו הָרְאָיָה!"- גִּטִּין מֹחַ ע"ב)