Exodus 20:24

An altar of earth thou shalt make unto Me, and shalt sacrifice thereon thy burnt offerings and thy peace-offerings, thy sheep and thine oxen. Such offerings were a type and figure of the heart of man, as it arose in true worship to the throne of God, for which reason also plain ground, the soil as the Lord created it, was the material which He preferred, that being found practically everywhere where the children of Israel would assemble for worship. In all places where I record My name I will come unto thee, and I will bless thee. God is confined neither to Temple nor to Tabernacle, but is able to reveal His glorious majesty at any place which He may choose. And wherever this takes place, those who are fortunate enough to be witnesses of such a revelation will become partakers of God's blessings. It is this fact which is of such great value to us believers of the New Testament, since we have the assurance that the presence of the Lord in the Word and in the Sacraments guarantees to us His blessings.