6 Thou shalt not wrest the judgment of thy poor in his cause.
7 Keep thee far from a false matter; and the innocent and righteous slay thou not: for I will not justify the wicked.
8 And thou shalt take no gift: for the gift blindeth the wise, and perverteth the words of the righteous.
While you should not favor a poor man just because he is poor, as stated in verse 3, verse 5 states that you should not deny a poor man justice just because he is poor, either. A man is a man, whether rich or poor and all are equal in God's eyes. All sin is worthy of death (Romans 6:23). Jesus came that ALL could have life, not just those who were of one financial category.
If you know something to not be true, or to be conspiratorial in nature, you should not involve yourself in the spreading of the lie or the conspiracy. Know the facts. Live by what you know for a FACT. This will help you to stay honest. Oh, and always be willing to admit when you were ignorant in your knowledge of the facts, should you find out at a later date that what you thought was true was not true.
Finally, stay away from bribes. Don't let anyone make you offers that you can't refuse. You CAN refuse anything if it means maintaining your integrity. More than that, you SHOULD refuse it. God will step in and control the circumstances (he has done this for me so many times!) and you will always end up where HE wants you to be. That is all that matters. Proverbs 22:1 says: “A good name is rather to be chosen than great riches, and loving favour rather than silver and gold.”
Furthermore, you don't take gifts when it comes to doing the right thing because you never want to put yourself in the position of having to owe someone, or to give anyone other than God the credit for where you are. Abraham understood this when he refused the gifts from the King of Sodom. (Genesis 14:22-23)