1 Corinthians 10:21 NIV
 You cannot drink the cup of the Lord and the cup of demons too; you cannot have a part in both the Lord’s table and the table of demons.  
1 Corinthians 15:33 NIV
 Do not be misled:   “Bad company corrupts good character.”   
1 Corinthians 5:9 NIV
 I wrote to you in my letter not to associate   with sexually immoral people—
1 John 1:5-7 NIV
 This is the message we have heard   from him and declare to you: God is light;   in him there is no darkness at all. If we claim to have fellowship with him and yet walk in the darkness,   we lie and do not live out the truth.   But if we walk in the light,   as he is in the light, we have fellowship with one another, and the blood of Jesus, his Son, purifies us from all  sin.  
1 Kings 18:21 NIV
 Elijah went before the people and said, “How long will you waver   between two opinions? If the Lord   is God, follow him; but if Baal is God, follow him.” But the people said nothing.
1 Peter 2:9-10 NIV
 But you are a chosen people,   a royal priesthood,   a holy nation,   God’s special possession,   that you may declare the praises of him who called you out of darkness into his wonderful light.   Once you were not a people, but now you are the people of God;   once you had not received mercy, but now you have received mercy.
1 Thessalonians 5:4-8 NIV
 But you, brothers and sisters, are not in darkness   so that this day should surprise you like a thief.   You are all children of the light   and children of the day. We do not belong to the night or to the darkness. So then, let us not be like others, who are asleep,   but let us be awake   and sober.   For those who sleep, sleep at night, and those who get drunk, get drunk at night.   But since we belong to the day,   let us be sober, putting on faith and love as a breastplate,   and the hope of salvation   as a helmet.  
Deuteronomy 22:9-11 NIV
 Do not plant two kinds of seed in your vineyard;   if you do, not only the crops you plant but also the fruit of the vineyard will be defiled.  Do not plow with an ox and a donkey yoked together.   Do not wear clothes of wool and linen woven together.  
Deuteronomy 7:2-3 NIV
 and when the Lord your God has delivered   them over to you and you have defeated them, then you must destroy   them totally.    Make no treaty   with them, and show them no mercy.   Do not intermarry with them.   Do not give your daughters to their sons or take their daughters for your sons,
Ephesians 4:17-20 NIV
 So I tell you this, and insist on it in the Lord, that you must no longer   live as the Gentiles do, in the futility of their thinking.   They are darkened in their understanding   and separated from the life of God   because of the ignorance that is in them due to the hardening of their hearts.   Having lost all sensitivity,   they have given themselves over   to sensuality   so as to indulge in every kind of impurity, and they are full of greed. That, however, is not the way of life you learned