Śatapatha Brāhmaṇa ("of a hundred paths") 11.4.2.2

11.4.2.2

itthameva kuryāt ubhābhyāmeva prāṇibhyāṃ juhūm parigṛhyopabhṛtyadhinidadhyāttasya nopamīmāṃsāsti tatpaśavyamāyuṣyaṃ te asaṃśiñjayannādadīta yatsaṃśiñjayedayogakṣemo yajamānamṛcettasmādasaṃśiñjayannādadīta

Let him rather do it in this way;--having taken the guhû with both hands, let him lay it down on the upabhrit; there is no question about this: it is good for (securing) cattle and life. Let him take them up without clinking them together,--were he to let them clink together, insecurity of property would befall the Sacrificer: let him, therefore, take them up without clinking them together.