Reference for Chullin 173:38

כוס של ברכה אתה שותה או ארבעים זהובים אתה נוטל

After they had eaten and drunk, he [Rabbi] said to him, 'Will you drink the cup of wine over which the Benedictions of the Grace [after meals] have been said, or would you rather have forty gold coins? ' He replied: 'I would rather drink the cup of wine'.

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