If ye do return unto the Lord with all your hearts, then put away the strange gods and Ashtaroth from among you, and prepare your hearts unto the Lord, and serve him only. I Sam. 7:3

Little children, keep yourselves from idols. I John 5:21

Come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing; and I will receive you, and will be a Father unto you, and ye shall be my sons and daughters, saith the Lord Almighty. II Cor. 6:17-18

Ye cannot serve God and Mammon. Matt. 6:24

Thou shalt worship no other god: for the LORD, whose name is Jealous, is a jealous God. Exo. 34:14

Serve him with a perfect heart and with a willing mind: for the LORD searcheth all hearts, and understandeth all the imaginations of the thoughts. I Chron. 28:9

Behold, thou desirest truth in the inward parts: and in the hidden part thou shalt make me to know wisdom. Psa. 51:6

Man looketh on the outward appearance, but the LORD looketh on the heart. I Sam. 16:7

Beloved, if our heart condemn us not, then have we confidence toward God. I John 3:21