As soon as ye be come into the city, ye shall straightway find him, before he go up to the high place to eat: for the people will not eat until he come, because he doth bless the sacrifice; and afterwards they eat that be bidden. Now therefore get you up; for about this time ye shall find him. He doth bless the sacrifice - He alone can perform the religious rites which are used on this occasion.
Afterwards they eat that be bidden - Among the Arabs, often a large feast is made of sacrificed camels, etc., and then the people of the vicinity are invited to come and partake of the sacrifice. This is the custom to which allusion is made here.