Reference for Arakhin 31:6

(משלי כז, יד) מברך רעהו בקול גדול בבוקר השכם קללה תחשב לו

It refers, for example, to the case of one who happened to stay in a house where they laboured much on his behalf, and next morning he goes out into the street and says: May the Merciful One bless So-and-so, who laboured so much on my behalf.

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