Related על גיטין 118:12

What is the order [in which the servants] pour the cup [of wine to the people eating]? In the middle of the meal, they (i.e. the servants) begin [pouring the wine] with the [most] senior [person]. After the meal, they (i.e. the servants) begin [pouring the wine] with the [person] who will lead [everyone] in the Birkat Hamazon (Grace After Meals). If [the person who was going to lead everyone in Birkat Hamazon] wanted to give honor to his Rebbi (teacher) or to someone who is greater than him [and have the servants pour his cup of wine first], he is allowed to do so.