The Children of Israel were told to keep three feasts each year - the feast of unleavened bread, the feast of first fruits, and the feast of ingathering. Should we still do that?

In Exodus 23:14-16, Moses receives the instructions about these feasts. Those three verses in Exodus comprise our brief story. Their inner meaning is explained in Arcana Coelestia 9286-9296.

There are three feasts. In the Word, the number three represents a completeness, a sense of things being covered from beginning to end. Our thankfulness to the Lord is supposed to keep going - to endure.

The first feast, of unleavened bread, stands for worship, for our thankfulness for the Lord's action in our minds to get rid of false ideas. That enables us to start to receive good loves.

The second feast, of first fruits, relates to the planting of true ideas in that "soil" of initial loves for doing good.

The third feast, of harvest, or ingathering, stands for the time when, by applying our true ideas, we receive real good - loves of the neighbor and of the Lord - that become the middle of our lives. This is the state of rebirth, where we have - by working through the year (our lives), and enduring in thankfulness, allowed the Lord to get rid of our false ideas, and push our evil loves to the periphery, so that good can work, and be fruitful.

These feasts, then, represent the progress of our spiritual lives. In some manner, we need to keep them.

2811. 'And Abraham built the altar there' means preparation of the Lord's Divine human. This is clear from the meaning of 'the altar' and of 'building the altar'. Altars used to mean all worship in general because they were the chief feature of the worship of the representative Church, 921. And because they meant all worship in general they meant the Lord's Divine Human, for the Lord's Divine Human is essentially present in all worship and all doctrine, so much so that it is the very essence of worship itself and doctrine itself. This becomes clear also from the Holy Supper which superseded altars, that is, burnt offerings and sacrifices, 2165, 2187, 2343, 2359. The Holy Supper is the chief feature of external worship because it is the Lord's Divine Human that is bestowed there. From all this it may become clear, and so without further explanation, that 'building an altar' means preparing the Divine human. The final preparation of the Lord's Divine human for undergoing the last degrees of temptation is the subject in the present verse and is described by the statement that Abraham laid the pieces of wood in order, bound Isaac his son, and laid him on the altar, upon the pieces of wood.