The first and great commandment is to love the Lord thy God with all thy heart, with all thy soul, and with all thy mind, and the second is like unto it, thou shalt love thy neighbor as thyself. (Matt. 22: 37-40). Another word that is often used in the scriptures to describe this kind of love is the word "cleave," hence the Apostle Paul counsels us to "cleave to that which is good" (Romans 12:9). Paul's missionary companion Barnabas, being filled with the grace of God, exhorted the early Christian's of Antioch "that with purpose of heart they would cleave unto the Lord." (Acts 11:23)
The commandment that is closest to the first great commandment is reflected in the second great commandment, and finds expression in another verse:
"Thou shalt love thy wife with all thy heart, and shalt cleave unto her and none else." (D&C 42:22)
And, notwithstanding we believe in Christ, we keep the law of Moses, and look forward with steadfastness unto Christ, until the law shall be fulfilled.
For, for this end was the law given; wherefore the law hath become dead unto us, and we are made alive in Christ because of our faith; yet we keep the law because of the commandments.
And we talk of Christ, we rejoice in Christ, we preach of Christ, we prophesy of Christ, and we write according to our prophecies, that our children may know to what source they may look for a remission of their sins." (2 Ne. 25:23-26)
As certain crusaders journeyed to the Holy Land, they cleaved unto Christ, singing Most Beautiful Lord Jesus:
"1. Fair is the sunshine,
Fairer the moonlight
And all the stars in heav'n above;
Jesus shines brighter,
Jesus shines purer
And brings to all the world his love.
Fairer the woodlands,
Robed in the flowers of blooming spring;
Jesus is fairer,
Jesus is purer.
He makes the sorrowing spirit sing.
Lord of the nations!
Son of God and Son of Man!
Thee will I honor, praise, and give glory,
Give praise and glory evermore!