Reference for Arakhin 9:25

כי אבעיא לן מקמי דאשמעה להא מתניתא השתא דשמעה הא מתניתא לא מיבעיא לן

Raba asked: [If someone said:] The valuation of myself I undertake to pay for the altar, is he adjudged according to his means, or not?

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