'One tenth' in the Bible
"If the person is poor and does not have sufficient means, he must take one male lamb as a guilt offering for a wave offering to make atonement for himself, one-tenth of an ephah of choice wheat flour mixed with olive oil for a grain offering, a log of olive oil,
then the one who presents his offering to the Lord must bring a grain offering of one-tenth of an ephah of finely ground flour mixed with one fourth of a hin of olive oil.
with one-tenth of an ephah of finely ground flour as a grain offering mixed with one quarter of a hin of pressed olive oil.
and one-tenth of an ephah of finely ground flour mixed with olive oil as a grain offering for each lamb, as a burnt offering for a pleasing aroma, an offering made by fire to the Lord.
For each of the seven lambs you are to offer one-tenth of an ephah,