Matthew 6:19-21, 24
19) Lay not up for yourselves treasures upon earth, where moth and rust doth corrupt, and where thieves break through and steal: 20) but lay up for yourselves treasures in heaven, where neither moth nor rust doth corrupt, and where thieves do not break through nor steal: 21) for where your treasure is, there will your heart be also.
24) No man 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.