'Issārôn (עִשָּׂרוֹן) means a tenth part, one-tenth of an ephah — a standard dry measure used in grain offerings. From 'eser (ten). Appears frequently in Levitical instructions for daily and festival offerings.
Exodus 29:40: 'With the first lamb offer a tenth of an ephah of the finest flour mixed with a quarter of a hin of oil.' Numbers 28:5: 'a tenth of an ephah of the finest flour for a grain offering.' The 'issārôn was the standard unit for grain offerings — the tithe principle built into the very fabric of daily worship. Every morning and evening sacrifice included this tenth-part offering, teaching Israel that a portion of their harvest belonged to God. Malachi 3:10: 'Bring the whole tithe into the storehouse.'