Mahabharat
न चौष्ठौ निर्भुजेज जातु न च वाक्यं समाक्षिपेत सदा कषुतं च वातं च षठीवनं चाचरेच छनैः ॥ ४-४-२८ ॥
'One should never bite the lips, nor should one interrupt speech/conversation. One should always suppress hunger, wind (flatulence), and spitting, doing so gradually/gently.' ॥ 4-4-28 ॥
english translation
na cauSThau nirbhujeja jAtu na ca vAkyaM samAkSipeta sadA kaSutaM ca vAtaM ca SaThIvanaM cAcareca chanaiH ॥ 4-4-28 ॥
hk transliteration by Sanscript