The words that you speak out of your mouth should be a reflection of what is in your heart. What you speak, teach, or preach should always be positive words of faith. Tell people about our Lord Jesus, confess it with your mouth that you believe it with your whole heart that Jesus died for your sins and God raised Him from the dead. Telling others about Christ is confessing with your mouth.
But what saith it? The word is nigh thee, even in thy mouth, and in thy heart: that is, the word of faith, which we preach; Rom. 10:8
That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved. Rom. 10:9
Ephesians 4:29 Let no corrupt communication proceed out of your mouth, but that which is good to the use of edifying, that it may minister grace unto the hearers. Ephesians 4:30 And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption. Ephesians 4:31 Let all bitterness, and wrath, and anger, and clamour, and evil speaking, be put away from you, with all malice: Ephesians 4:32 And be ye kind one to another, tenderhearted, forgiving one another, even as God for Christ's sake hath forgiven you.
Proverbs 18:21 - Death and life [are] in the power of the tongue: and they that love it shall eat the fruit thereof.
Matthew 15:18 - But those things which proceed out of the mouth come forth from the heart; and they defile the man.
Proverbs 12:18 - There is that speaketh like the piercings of a sword: but the tongue of the wise [is] health.
Matthew 12:36 - But I say unto you, That every idle word that men shall speak, they shall give account thereof in the day of judgment.
Proverbs 16:24 - Pleasant words [are as] an honeycomb, sweet to the soul, and health to the bones.
Colossians 3:8 - But now ye also put off all these; anger, wrath, malice, blasphemy, filthy communication out of your mouth.
Matthew 12:37 - For by thy words thou shalt be justified, and by thy words thou shalt be condemned.
Proverbs 13:3 - He that keepeth his mouth keepeth his life: [but] he that openeth wide his lips shall have destruction.
Proverbs 15:1 - A soft answer turneth away wrath: but grievous words stir up anger.
Proverbs 21:23 - Whoso keepeth his mouth and his tongue keepeth his soul from troubles.
James 1:26 - If any man among you seem to be religious, and bridleth not his tongue, but deceiveth his own heart, this man's religion [is] vain.
Psalms 19:14 - Let the words of my mouth, and the meditation of my heart, be acceptable in thy sight, O LORD, my strength, and my redeemer.
James 3:1-12 - My brethren, be not many masters, knowing that we shall receive the greater condemnation.
Proverbs 15:4 - A wholesome tongue [is] a tree of life: but perverseness therein [is] a breach in the spirit.
Proverbs 29:20 - Seest thou a man [that is] hasty in his words? [there is] more hope of a fool than of him.