Bhagavatapurana 3.11.8

3.11.8

laghūni vai samāmnātā daśa pañca ca nāḍikā /
te dve muhūrtaḥ praharaḥ ṣaḍ yāmaḥ sapta vā nṛṇām //

Verse 8. *V.* Here the measure of Time according to men is intended; hence it is said नॄणाम् *D.* the six Nadikas make one Prahara and seven make one Yama (याम) 9. A measure of capacity made of copper weighing 6 pollums, the sides being 4 times 4 inches high with holes made at the bottom by gold mashas,—the time taken by water to fill that vessel through those holes is said to be a Nadika.