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Deuteronomy 4:2

You shall not add to the word which I command you, nor take from it, that you may keep the commandments of the LORD your God which I command you.

Psalm 19:7-11

7 The law of the LORD is perfect, converting the soul;
The testimony of the LORD is sure, making wise the simple;
8 The statutes of the LORD are right, rejoicing the heart;
The commandment of the LORD is pure, enlightening the eyes;
9 The fear of the LORD is clean, enduring forever;
The judgments of the LORD are true and righteous altogether.
10 More to be desired are they than gold,
Yea, than much fine gold;
Sweeter also than honey and the honeycomb.
11 Moreover by them Your servant is warned,
And in keeping them there is great reward.

Isaiah 8:20

To the law and to the testimony! If they do not speak according to this word, it is because there is no light in them.

John 15:11

“These things I have spoken to you, that My joy may remain in you, and that your joy may be full.

John 20:30-31

30 And truly Jesus did many other signs in the presence of His disciples, which are not written in this book; 31 but these are written that you may believe that Jesus is the Christ, the Son of God, and that believing you may have life in His name.

Acts 17:11

These were more fair-minded than those in Thessalonica, in that they received the word with all readiness, and searched the Scriptures daily to find out whether these things were so.

2 Timothy 3:15-17

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.
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.

1 John 1:4

And these things we write to you that your joy may be full.