John 14:26But the Advocate, the Holy Spirit, whom the Father will send in my name, will teach you all things and will remind you of everything I have said to you. How will He teach and remind us of everything said to us? The Bible.
Deut 8 2 Remember how the Lord your God led you all the way in the wilderness these forty years, to humble and test you in order to know what was in your heart, whether or not you would keep his commands.3 He humbled you, causing you to hunger and then feeding you with manna, which neither you nor your ancestors had known, to teach you that man does not live on bread alone but on every word that comes from the mouth of the Lord. What is the word that comes from His mouth? The Bible.
John 16:13But when he, the Spirit of truth, comes, he will guide you into all the truth. He will not speak on his own; he will speak only what he hears, and he will tell you what is yet to come. How will He guide us into all truth? The Bible. How will does He tell us? The Bible.
John 3:34For the one whom God has sent speaks the words of God, for God gives the Spirit without limit. What are the words of God? The Bible.
Matthew 4:4Jesus answered, “It is written: ‘Man shall not live on bread alone, but on every word that comes from the mouth of God.’” Again, what are these words? The Bible.
John 6:35Then Jesus declared, “I am the bread of life. Whoever comes to me will never go hungry, and whoever believes in me will never be thirsty. How do we know this? The bible.
John 1:1 In the beginning was the Word, and the Word was with God, and the Word was God. In the beginning was the Word or "logos" gk. the Eternal Word of God, the second Person of the Holy Trinity. How has God revealed this to the world? His perfect written word, the Bible.
"Sanctify them in your truth" What is truth? "Your word is truth." John 17:17 ESV