Kauṣītaki (Śāṅkhāyana) Brāhmaṇa 10.6.17

10.6.17

sarveṇa ha vā eṣa ātmanā sarveṇa manasā yajñam sambharate yo yajate / (paśu: paśau prayāja anuyājāh)

Whoever sacrifices gathers the sacrifice with his whole self, with his whole mind;