SB 10.4.40

tasmāt — therefore; sarva-ātmanā — in every respect; rājan — O King; brāhmaṇān — the brāhmaṇas; brahma-vādinaḥ — who maintain the brahminical culture, centered around Viṣṇu; tapasvinaḥ — persons who are engaged in austerities; yajña-śīlān — persons engaged in offering sacrifices; gāḥ ca — cows and persons engaged in protecting cows; hanmaḥ — we shall kill; haviḥ-dughāḥ — because they supply milk, from which clarified butter is obtained for the offering of sacrifice.