"thou shalt meditate therein day and night" Joshua 1:8
Bible meditation is simply reading (and/or repeating) scriptures to yourself. You can read out loud or quietly. What I like to do is read a group of verses on a particular topic, and when I see a verse I really like, I read it out loud to myself. Sometimes I insert my name or personalize the verse. Speaking the Word of God to yourself is probably the best way to increase your faith.
This book of the law shall not depart out of thy mouth; but thou shalt meditate therein day and night, that thou mayest observe to do according to all that is written therein: for then thou shalt make thy way prosperous, and then thou shalt have good success. Joshua 1:8
Blessed is the man that walketh not in the counsel of the ungodly, nor standeth in the way of sinners, nor sitteth in the seat of the scornful. 2 But his delight is in the law of the LORD; and in his law doth he meditate day and night. 3 And he shall be like a tree planted by the rivers of water, that bringeth forth his fruit in his season; his leaf also shall not wither; and whatsoever he doeth shall prosper. Psalm 1:1-3
Let the words of my mouth, and the meditation of my heart, be acceptable in thy sight, O LORD, my strength, and my redeemer. Psalms 19:14
O how love I thy law! it is my meditation all the day. Psalms 119:97
As for me, this is my covenant with them, saith the LORD; My spirit that is upon thee, and my words which
I have put in thy mouth, shall not depart out of thy mouth, nor out of the mouth of
thy seed, nor out of the mouth of thy seed's seed, saith the LORD, from henceforth and for ever.
A good man out of the good treasure of his heart bringeth forth that which is good; and an evil man out of the evil treasure of his heart bringeth forth that which is evil: for of the abundance of the heart his mouth speaketh. Luke 6:45
Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report; if there be any virtue, and if there be any praise, think on these things. Philippians 4:8