Exodus 16:33-34
And Moses said unto Aaron, Take a pot, and put an omer full of manna therein, and lay it up before the Lord, to be kept for your generations. As the Lord commanded Moses, so Aaron laid it up before the Testimony, to be kept.
What God commands to be kept, keeps. The same manna that could not be kept overnight, kept for two days on the Sabbath. The same manna that could not ever be kept for three days, kept for generations as a Testimony of God's provision in the wilderness. Whatever God commands to be kept will keep. What He says does not spoil. His Word never goes to the worms. It is a living seed that develops deep roots and climbs to the skies.
The commands of Christ cannot fail and anyone who walks in them has the promise of His presence in them:
"I am with you always, even unto the end of the world. Amen." — Matthew 28:20.
Those who keep His commission are kept in their keeping of it and when they teach the nations to keep Christ's commands, He is with them in that. He is in the commands He is in the insistence upon them, and He is in the obedience to them; He is in all of it:
"one Lord, one faith, one baptism, one God and Father of all, who is above all, and through all, and in you all." — Ephesians 4:5-6