Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway, even unto the end of the world. Amen.
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Matthew 28:18-20
Tyndale Open Study Notes (CC BY-SA 4.0).
28:20 Teach: The disciples’ curriculum is comprised of all the commands of Jesus (e.g., the Sermon on the Mount, chs 5–7). The church is to be marked by its obedience to Jesus’ commands (5:17-20; 7:13-27). Jesus’ authority and presence are the basis for the disciples’ mission (see also 1:23; 18:20).
Other Bible passages linked to this one, most cited first.
Fear thou not; for I am with thee: be not dismayed; for I am thy God: I will strengthen thee; yea, I will help thee; yea, I will uphold thee with the right hand of my righteousness.
There shall not any man be able to stand before thee all the days of thy life: as I was with Moses, so I will be with thee: I will not fail thee, nor forsake thee.
Then spake the Lord to Paul in the night by a vision, Be not afraid, but speak, and hold not thy peace: For I am with thee, and no man shall set on thee to hurt thee: for I have much people in this city.
I will not leave you comfortless: I will come to you. Yet a little while, and the world seeth me no more; but ye see me: because I live, ye shall live also. At that day ye shall know that I am in my Father, and ye in me, and I in you.
The LORD of hosts is with us; the God of Jacob is our refuge. Selah.
And the LORD was with Joseph, and he was a prosperous man; and he was in the house of his master the Egyptian. And his master saw that the LORD was with him, and that the LORD made all that he did to prosper in his hand.
Authorship: the book itself or Christian tradition. Approximate dates, as in Carson and Moo, An Introduction to the New Testament, and Longman and Dillard, An Introduction to the Old Testament.