thou shalt go to the house of prayer and offer up thy sacraments upon my holy day; thou shalt go to the house of prayer and offer up thy sacraments upon my holy day; D&C 59:9

Doctrine & Covenants 59:9-12

And that thou mayest more fully keep thyself unspotted from the world, thou shalt go to the house of prayer and offer up thy sacraments upon my holy day;
For verily this is a day appointed unto you to rest from your labors, and to pay thy devotions unto the Most High;
Nevertheless thy vows shall be offered up in righteousness on all days and at all times;
But remember that on this, the Lord’s day, thou shalt offer thine oblations and thy sacraments unto the Most High, confessing thy sins unto thy brethren, and before the Lord.
Doctrine & Covenants 59:9-12

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...in the ordinances thereof, the power of godliness is manifest. D&C 84:20

Doctrine & Covenants 84:19-21

And this greater priesthood administereth the gospel and holdeth the key of the mysteries of the kingdom, even the key of the knowledge of God.
Therefore, in the ordinances thereof, the power of godliness is manifest.
And without the ordinances thereof, and the authority of the priesthood, the power of godliness is not manifest unto men in the flesh;
Doctrine & Covenants 84:19-21

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