Luke 16:10-13 KJV
10 He that is faithful in that which is least is faithful also in much: and he that is unjust in the least is unjust also in much. 11 If therefore ye have not been faithful in the unrighteous mammon, who will commit to your trust the true riches? 12 And if ye have not been faithful in that which is another man's, who shall give you that which is your own? 13 No servant can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one, and despise the other. Ye cannot serve God and mammon.
Malachi 3:8-10 KJV
8 Will a man rob God? Yet ye have robbed me. But ye say, Wherein have we robbed thee? In tithes and offerings. 9 Ye are cursed with a curse: for ye have robbed me, even this whole nation. 10 Bring ye all the tithes into the storehouse, that there may be meat in mine house, and prove me now herewith, saith the Lord of hosts, if I will not open you the windows of heaven, and pour you out a blessing, that there shall not be room enough to receive it.