And thou shalt go unto the priest that shall be in those days, and say unto him, I profess this day unto the Lord thy God, that I am come unto the country which the Lord sware unto our fathers for to give us. (Deuteronomy 26:3)
That is, at the time of the three great feasts (Ex. 23:14-16). In later times the worshipers were to bring their offerings to the Temple in Jerusalem for these feasts, praising God in His sanctuary. With confession of sin and grateful prayer they were to acknowledge God’s goodness in bringing them out of Egyptian bondage into the Promised Land.