Romans 14:21-23

Young's Literal Translation

²¹ Right [it is] not to eat flesh, nor to drink wine, nor to [do anything] in which thy brother doth stumble, or is made to fall, or is weak.

²² Thou hast faith! to thyself have [it] before God; happy is he who is not judging himself in what he doth approve,

²³ and he who is making a difference, if he may eat, hath been condemned, because [it is] not of faith; and all that [is] not of faith is sin.