Manusmriti

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जालान्तरगते भानौ यत् सूक्ष्मं दृश्यते रजः । प्रथमं तत् प्रमाणानां त्रसरेणुं प्रचक्षते ॥ १३२ ॥

sanskrit

The very small mote which is seen when the sun shines through a lattice, they declare (to be) the least of (all) quantities and (to be called) a trasarenu (a floating particle of dust).

english translation

jAlAntaragate bhAnau yat sUkSmaM dRzyate rajaH | prathamaM tat pramANAnAM trasareNuM pracakSate || 132 ||

hk transliteration by Sanscript