I read this excellent post by CHS in his devotional "Faith Thoughts" - it handles the subject of Friendship and deficient toxic friends that steal energy and cause compromise in people's lives. I am taking the liberty to quote the whole article on this blog today.
"John 15:12-15, Friendship is a blessing and a provision, but it must never be permitted to replace the priority of Christ's Lordship. The test of true friendship is whether it honors the Word. It does not lead to compromise, but builds up both believers in the faith and in the Body of Christ (the church). Friendship is not to be used as a support system, but as a communication of love. True friends may be separated for long periods of time, yet enjoy a closer fellowship than people who are together every day. Friendship does not compromise obedience to the cross, but encourages the daily appropriation of the truth of the finished work! Rather than a relationship centered around self-gratification, true friendship expresses the burden and heartbeat of Jesus Christ to redeem believers to Himself. Subjective, personality rapport relationships are destructive, but godly ones will result in doctrinal rapport around the principles of truth. Lonely people often seek gratification and fulfillment through friendship, but this is a selfish motive based on temporal needs. Friendships that are premised upon eternal values bind the hearts of men in spiritual oneness (2). This type of relationship is only possible because of the grace of God functioning in the heart of man. This is through identification with the death, burial and resurrection of Jesus Christ. Thus, we see that the Word of God is the basis for true friendship."
This is my commandment, That ye love one another, as I have loved you. Greater love hath no man than this, that a man lay down his life for his friends. Ye are my friends, if ye do whatsoever I command you. Henceforth I call you not servants; for the servant knoweth not what his lord doeth: but I have called you friends; for all things that I have heard of my Father I have made known unto you. - John 15:12-15
From whom the whole body fitly joined together and compacted by that which every joint supplieth, according to the effectual working in the measure of every part, maketh increase of the body unto the edifying of itself in love. - Ephesians 4:16