Romans 14:20-23
20 Overthrow not for meat's sake the work of God. All things indeed are clean; howbeit it is evil for that man who eateth with offence.
21 It is good not to eat flesh, nor to drink wine, nor [to do anything] whereby thy brother stumbleth.
22 The faith which thou hast, have thou to thyself before God. Happy is he that judgeth not himself in that which he approveth.
23 But he that doubteth is condemned if he eat, because [he eateth] not of faith; and whatsoever is not of faith is sin.