Shami which is mentioned here means men who have not become Buddhist monk even if they have become a priest, and choro means Kokushichoro who were the greatest of all Buddhist monks at the time.
ここで言う沙弥とは、出家してもまだ正式な僧侶になっていない男子を指し、長老とは当時の僧侶の最高峰である国師長老を指す。