Manusmriti
प्रतिश्रावणसम्भाषे शयानो न समाचरेत् । नासीनो न च भुञ्जानो न तिष्ठन्न पराङ्मुखः ॥ १९५ ॥
Let him not answer or converse with (his teacher), reclining on a bed, nor sitting, nor eating, nor standing, nor with an averted face.
english translation
pratizrAvaNasambhASe zayAno na samAcaret । nAsIno na ca bhuJjAno na tiSThanna parAGmukhaH ॥ 195 ॥
hk transliteration by Sanscript