Deut 10:12, 1 Cor 10:20-21, Mt 6:24, Acts 4:12, Jn 14:6
In the Old Testament, Joshua commanded the Israelites to abandon foreign gods and serve only God. (Joshua 24:14,23)
Joshua 24:14 Now therefore fear the Lord, and serve him in sincerity and in truth: and put away the gods which your fathers served on the other side of the flood, and in Egypt; and serve ye the Lord. 23 Now therefore put away, said he, the strange gods which are among you, and incline your heart unto the Lord God of Israel.
In the Old Testament, Moses also commanded the Israelites to fear God and serve only God. (Deut 10:12)
Deut 10:12 And now, Israel, what doth the Lord thy God require of thee, but to fear the Lord thy God, to walk in all his ways, and to love him, and to serve the Lord thy God with all thy heart and with all thy soul,
The Gentiles sacrifice, they sacrifice to devils. (1 Cor 10:20-21)
1 Cor 10:20 But I say, that the things which the Gentiles sacrifice, they sacrifice to devils, and not to God: and I would not that ye should have fellowship with devils. 21 Ye cannot drink the cup of the Lord, and the cup of devils: ye cannot be partakers of the Lord's table, and of the table of devils.
We cannot serve God and money at the same time. (Mt 6:24)
Mt 6:24 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.
Only those who believe in Jesus as the Christ can be saved. (Acts 4:12, John 14:6)
Acts 4:12 Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved.
John 14:6 Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me.