Impossible because the Bible tells us that He said many things which were not recorded. In fact all that is recorded of His speaking can be recited in a 2 hour lecture.
John 20:30 Jesus performed many other signs in the presence of his disciples, which are not recorded in this book. 31
But these are written that you may believe that Jesus is the Messiah, the Son of God, and that by believing you may have life in his name.
Romans 16:25-27 Now to him who is able to
establish you by my gospel and the proclamation of Jesus Christ,
according to the revelation of the mystery hidden for long ages past, but now revealed and made known through the prophetic writings by the command of the eternal God,
so that all nations might believe and obey him–to the only wise God be glory forever through Jesus Christ! Amen.
Did you read that? Paul says that the prophetic writings of the Old Testament were made known.
Paul says so that all nations might believe and OBEY HIM.
The apostles from the New Testament received all the truth we need to guide us to eternal life. All we need to guide us to eternal life is written down in the Scriptures: John 16:13; 2 Peter 1:3; Acts 20:20, 27; Matthew 28:20; I Corinthians 14:37; 2 Timothy 3:16, 17.