Reference for Pesachim 207:2
מאי בינייהו איכא בינייהו יום טוב שחל להיות אחר השבת דחתמינן בין קודש לקודש
and Rab Judah said Samuel's name: He who recites habdalah must say [something] in the nature of the conclusion near to its conclusion. While the Pumbeditheans maintain: [He must say something] in the nature of the commencement just before its conclusion.
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