The Rule of St. Benedict

But let the brother who is found guilty of a graver fault be excluded from both the table and the oratory. Let none of the brethren join his company or speak with him. Let him be alone at the work enjoined on him, persevering in penitential sorrow, mindful of the terrible sentence of the Apostle who saith, that "such a man is delivered over for the destruction of the flesh, that the spirit may be saved in the day of the Lord" (1 Cor 5:5). Let him get his food alone in such quantity and at such a time as the Abbot shall deem fit; and let him not be blessed by anyone passing by, nor the food that is given him.