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Revelation from God has been given in written form known as scripture.
Romans 15:4 For whatever things were written before were written for our learning, that we through the patience and comfort of the Scriptures might have hope.
2 Timothy 3:16 All Scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness, 17 that the man of God may be complete, thoroughly equipped for every good work.
Hebrews 1: 1 God, who at various times and in various ways spoke in time past to the fathers by the prophets,
2 has in these last days spoken to us by His Son...
Revelation 1:1 The Revelation of Jesus Christ, which God gave Him to show His servants—things which must shortly take place. And He sent and signified it by His angel to His servant John,
Revelation 22:18 For I testify to everyone who hears the words of the prophecy of this book: If anyone adds to these things, God will add to him the plagues that are written in this book; 19 and if anyone takes away from the words of the book of this prophecy, God shall take away his part from the Book of Life, from the holy city, and from the things which are written in this book.
Acts 2:42 And they continued steadfastly in the apostles’ doctrine and fellowship, in the breaking of bread, and in prayers.
1 Timothy 1:3 As I urged you when I went into Macedonia—remain in Ephesus that you may charge some that they teach no other doctrine,
1Timothy 4:16 Take heed to yourself and to the doctrine. Continue in them, for in doing this you will save both yourself and those who hear you.
2John 1:10 If anyone comes to you and does not bring this doctrine, do not receive him into your house nor greet him;
Mark 16:15 And He said to them, "Go into all the world and preach the gospel to every creature.16 "He who believes and is baptized will be saved; but he who does not believe will be condemned.
Matthew 24:11 "Then many false prophets will rise up and deceive many.
2Timothy 3:15 and that from childhood you have known the Holy Scriptures, which are able to make you wise for salvation through faith which is in Christ Jesus.