大日經持誦次第儀軌 1.155

1.155

如是住，先成就本尊瑜伽。飯食訖已，所餘觸食以成辦諸事真言心供養所應食者。當用不空威怒增加，聖不動真言當誦一遍，受者歡喜，常隨行人與護念之。

Abiding thus, one first accomplishes the yoga of the iṣṭadevatā. When the meal is finished, the remaining touched food is offered to those who should eat it with the karma-accomplishing hṛdaya-mantra. One should employ the increasing Amoghapracaṇḍa Āryācala mantra, reciting it once; the recipients will rejoice, constantly follow the practitioner, and protect and remember him.