Atharvaveda 11.3.48

11.3.48

[4.17]a) tátaś cainam anyā́bhyāṃ hástābhyāṃ prā́śīr yā́bhyāṃ caitáṃ pū́rva ŕ̥ṣayaḥ prā́śnan |
[4.17]b) brāhmaṇáṃ haniṣyasī́ty enam āha |
[4.17]c) táṃ vā́ aháṃ nā́rvā́ñcaṃ ná párāñcaṃ ná pratyáñcam |
[4.17]d) r̥tásya hástābhyām |
[4.17]e) tā́bhyām enaṃ prā́śiṣaṃ tā́bhyām enam ajīgamam |
[4.17]f) eṣá vā́ odanáḥ sárvāṅgaḥ sárvaparuḥ sárvatanūḥ |
[4.17]g) sárvāṅga evá sárvaparuḥ sárvatanūḥ sáṃ bhavati yá eváṃ véda ||48|| [17]

If thou hast eaten it with other hands than those with which the ancient seers ate this, thou wilt slay a Brahman: thus one says to him; it verily [have] I not [eaten] coming hither, nor retiring, nor coming on; with the hands of righteousness (ṛtá), therewith have I etc. etc.