स यदि यजुष्टो रिष्येद्भुवः स्वाहेति दक्षिणाग्नौ जुहुयाद्यजुषामेव तद्रसेन यजुषां वीर्येण यजुषां यज्ञस्य विरिष्टं संदधाति ॥ ४.१७.५ ॥
In plain words
And if it is harmed on the side of the Yajus, let him offer in the southern fire with "bhuvaḥ, svāhā." Thus by the very essence of the formulas of the Yajus, by their strength, he mends the harm done to the sacrifice on the side of the Yajus.