Deuteronomy 26:1-2

When thou art come into the land Every Israelite being obliged, by law, to offer the first-fruits of his field and vineyard at the tabernacle, at the proper seasons of the year, Moses now prescribes to them the forms of solemn profession and prayer with which each offerer should present them. Thou shalt go unto the place which the Lord shall choose This seems to have been especially enjoined to each master of a family, and the time when these first-fruits were to be presented was the feast of pentecost, Exodus 23:16; when, as well as at the two other great feasts, that of the passover, and that of tabernacles, they were obliged to go up to the place of God's altar.