genesis 1:29-30: god says that humans and all land-based animals should eat plants, and that he declared this creation "very good". genesis 2:16-17: god says that every herb-bearing seed and tree with fruit are for people to eat.  romans 14:2-3: people should not judge others for what they eat or do not eat.  isaiah 11:69: the vision of the peaceable kingdom suggests that god will restore a time when all animals eat plants.
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