Hi,
On the subject of "fleecing the flock" there are enough direct warnings, here's a few.
1 Peter 5:1-3 (New International Version)
To Elders and Young Men
1 To the elders among you, I appeal as a fellow elder, a witness of Christ's sufferings and one who also will share in the glory to be revealed: 2 Be shepherds of God's flock that is under your care, serving as overseers—not because you must, but because you are willing, as God wants you to be; not greedy for money, but eager to serve; 3 not lording it over those entrusted to you, but being examples to the flock.
1 Timothy 3:1-8 (New International Version)
1 Timothy 3
Overseers and Deacons
1 Here is a trustworthy saying: If anyone sets his heart on being an overseer, he desires a noble task. 2 Now the overseer must be above reproach, the husband of but one wife, temperate, self-controlled, respectable, hospitable, able to teach, 3 not given to drunkenness, not violent but gentle, not quarrelsome, not a lover of money. 4 He must manage his own family well and see that his children obey him with proper respect. 5 (If anyone does not know how to manage his own family, how can he take care of God's church?) 6 He must not be a recent convert, or he may become conceited and fall under the same judgment as the devil. 7 He must also have a good reputation with outsiders, so that he will not fall into disgrace and into the devil's trap.
8 Deacons, likewise, are to be men worthy of respect, sincere, not indulging in much wine, and not pursuing dishonest gain.
Titus 1:7 (New International Version)
7 Since an overseer is entrusted with God's work, he must be blameless—not overbearing, not quick-tempered, not given to drunkenness, not violent, not pursuing dishonest gain.
1 Timothy 6:3-10 (New International Version)
Love of Money
3 If anyone teaches false doctrines and does not agree to the sound instruction of our Lord Jesus Christ and to godly teaching, 4 he is conceited and understands nothing. He has an unhealthy interest in controversies and quarrels about words that result in envy, strife, malicious talk, evil suspicions 5 and constant friction between men of corrupt mind, who have been robbed of the truth and who think that godliness is a means to financial gain.
6 But godliness with contentment is great gain. 7 For we brought nothing into the world, and we can take nothing out of it. 8 But if we have food and clothing, we will be content with that. 9 People who want to get rich fall into temptation and a trap and into many foolish and harmful desires that plunge men into ruin and destruction. 10 For the love of money is a root of all kinds of evil. Some people, eager for money, have wandered from the faith and pierced themselves with many griefs.
With regard to tithing, there are many scriptures. However, the main one you should note at the outset it this
2 Corinthians 9:7 (New International Version)
7 Each man should give what he has decided in his heart to give, not reluctantly or under compulsion, for God loves a cheerful giver.
All the best,
Stephen