I know I have seen these questions asked and answered more times than I can count, but just cuz you asked I'll take my turn and help you out - though I kinda doubt it will stop the questions (we know how much fun y'all have in asking them every time your dogmas are challenged). We all know the specific words "sola scriptura", "trinity" and "sola fide" are not in the Bible, however we cannot say that these doctrines are not clearly stated. So here's my feeble attempt to convince those who really want to know - other than the idle curiosity seekers or pranksters.
Sola Scriptura: the belief that the revealed words of God known as "Scripture", "Holy Scripture", the "Bible" and the "Holy Bible" contains all knowledge necessary for salvation and holiness. As Martin Luther said, "The true rule is this: God's Word shall establish articles of faith, and no one else, not even an angel can do so.". Some Scripture references for this are:
II Peter 1:16-21 "For we did not follow cunningly devised fables when we made known to you the power and coming of our Lord Jesus Christ, but were eyewitnesses of His majesty. 17 For He received from God the Father honor and glory when such a voice came to Him from the Excellent Glory: “This is My beloved Son, in whom I am well pleased.” 18 And we heard this voice which came from heaven when we were with Him on the holy mountain. 19 And so we have the prophetic word confirmed, which you do well to heed as a light that shines in a dark place, until the day dawns and the morning star rises in your hearts; 20 knowing this first, that no prophecy of Scripture is of any private interpretation, 21 for prophecy never came by the will of man, but holy men of God spoke as they were moved by the Holy Spirit."
II Thess. 2:15 "So then, brothers and sisters, stand firm and hold fast to the teachings we passed on to you, whether by word of mouth or by letter."
II Tim. 3:15-17 "and how from infancy you have known the Holy Scriptures, which are able to make you wise for salvation through faith in Christ Jesus. 16 All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness, 17 so that the servant of God may be thoroughly equipped for every good work."
Jeremiah 8:8-9 "9 The wise will be put to shame; they will be dismayed and trapped. Since they have rejected the word of the LORD, what kind of wisdom do they have?"
Isaiah 8:19-20 "When someone tells you to consult mediums and spiritists, who whisper and mutter, should not a people inquire of their God? Why consult the dead on behalf of the living? Consult God’s instruction and the testimony of warning. If anyone does not speak according to this word, they have no light of dawn."
I Cor. 14:37 "If anyone thinks they are a prophet or otherwise gifted by the Spirit, let them acknowledge that what I am writing to you is the Lord’s command."
John 10:35 "If he called them ‘gods,’ to whom the word of God came—and Scripture cannot be set aside"
Joshua 1:8 "Keep this Book of the Law always on your lips; meditate on it day and night, so that you may be careful to do everything written in it. Then you will be prosperous and successful."
Where is the "trinity" found in Scripture? How about here:
Matthew 28:19 "Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost"
I John 5:7 "For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one."
We also have many, many verses where Jesus is called God, Almighty God, Everlasting Father. He is the Alpha and Omega, the first and the last as is Almighty God, the father. They are one. The Holy Spirit is also God and one with the Father and Son.
Finally, "sola fide". What is it first of all? The doctrine of sola fide or "by faith alone" asserts God's pardon for guilty sinners is granted to and received through faith, conceived as excluding all "works", alone. We see from Scripture (BTW - there are easily hundreds of verses that imply salvation is by grace through faith, that believing in Christ is the way we are saved. Only a few for demonstration.):
John 11:25 "Jesus said unto her, I am the resurrection, and the life: he that believeth in me, though he were dead, yet shall he live"
John 3:16 "For God so loved the world that he gave his only begotten son that whosoever believeth in him shall not perish but have everlasting life."
Romans 3:28 "Therefore we conclude that a man is justified by faith without the deeds of the law."
Titus 3:5 "not by works of righteousness which we have done, but according to His mercy He saved us, through the washing of regeneration and renewing of the Holy Spirit"