Manusmriti
एतत् त्रयं हि पुरुषं निर्दहेदवमानितम् । तस्मादेतत् त्रयं नित्यं नावमन्येत बुद्धिमान् ॥ १३६ ॥
Because these three, when treated with disrespect, may utterly destroy him; hence a wise man must never despise them.
english translation
etat trayaM hi puruSaM nirdahedavamAnitam । tasmAdetat trayaM nityaM nAvamanyeta buddhimAn ॥ 136 ॥
hk transliteration by Sanscript