1 Timothy 4:4

Translate as Greek, "Because" (expressing a reason resting on an objective fact; or, as here, a Scripture quotation)--"For" (a reason resting on something subjective in the writer's mind). every creature . . . good-- (Gen 1:31; Rom 14:14, Rom 14:20). A refutation by anticipation of the Gnostic opposition to creation: the seeds of which were now lurking latently in the Church. Judaism (Act 10:11-16; Co1 10:25-26) was the starting-point of the error as to meats: Oriental Gnosis added new elements. The old Gnostic heresy is now almost extinct; but its remains in the celibacy of Rome's priesthood, and in its fasts from animal meats, enjoined under the penalty of mortal sin, remain. if . . . with thanksgiving--Meats, though pure in themselves, become impure by being received with an unthankful mind (Rom 14:6; Tit 1:15).

— Jamieson-Fausset-Brown Commentary (public domain)