The Daf this week touched on the practice of covering the challah before the Shabbos meal (Pesachim 100a-b). Three reasons are offered for this practice. Tosfos cites two of them. The first is from Rav Achai Gaon.

More on Hamotzi and Bread

All of Hamotzi and Bread Braiding Challah on Yom Tov Burnt Challah for Lechem Mishneh Buying Bakery Challah for Shabbos Covering the Challah During Kiddush Dipping Challah in Salt Three Times Hamotzi on a Whole Loaf Interruption Between Hamotzi and Eating Keeping Challah Warm for Shabbos Machine Matzah for Lechem Mishneh Salt on the Table at Hamotzi Sliced Bread for Lechem Mishneh Throwing Challah at the Table Throwing Pastries at an Aufruf Toothpicks for Lechem Mishneh Washing Hands for Wet Food Washing Hands for Wet Foods Where to Cut the Challah