There are scriptures to back tithing both in old and new testament. I will not mention the old testament scripture because a lot of people knows it. A lot of people believe that Jesus didn't mention or support tithing, but Jesus did. Matthew 23:23 KJV says,  'Woe unto you, scribes and Pharisees, hypocrites! for ye pay tithe of mint and anise and cummin, and have omitted the weightier matters of the law, judgment, mercy, and faith: these ought ye to have done, and not to leave the other undone.'
I am not in support of pastors who are living a flamboyant life style while their church members are living in abject poverty. It is not our duty to Juge them. Jugement is for God. Solomon the wisest king, through the end of his life he said, in Ecclesiastes 12:13-14, Fear God and keep his commandments,for this is the duty of all mankind. For God will bring every deed into judgment, including every hidden thing, whether it is good or evil.

Brothers and sisters pay your tithe and leave judgment for God.