Reference for Bekhorot 77:2

אם תימצי לומר בסעודה ראשונה קודם אכילה או לאחר אכילה

If you say that the first meal is meant, then the question arises, has it to be given before the meal or after the meal.<span class="x" onmousemove="('comment',' For if we adopt the view that every single meal is meant, then it is immaterial whether before or after the meal, since when the second meal arrives, although it is after a meal (the first one) , we still give it this food to eat.');">¹</span>

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